62 
foreliggende Exemplar er vistnok en Han. medens det til 
Grund for Hellers Beskrivelse af 1). spimdosa liggende 
Exemplar er ,en Hun; men da det nedenfor beskrevne In- 
divid aabenbart endnu ikke er slaegtsmodent udviklet, er der 
heller ikke nogen Grund til at antage, at Skulpturen i 
maerkbar Grad afviger fra samme bos Hunnen. Det er 
nemlig ifjalge mine Undersogelser fprst efter den Hudskift- 
ning, der gaar umiddelbart forud for den slsegtsmodne Til- 
stand, at de ofte mserkelige Forandringer i Legemets Eorrn 
og Skulptur bos Cumacehannerne optrseder, der tidligere liar 
givet Anledning til Opstillelsen af Here nominelle saavel 
Arter som Slaegter. Jeg kan derfor heller ikke tvirle om, 
at de for naemerende Art fra Skulpturen hentede Distinc- 
tionscharacterer er af virkelig specifisk Ysegt ligeoverfor 
Hellers Art. 
Beskrivelse. Legemets Eoriu er (se PI. YU, Pig. 
1 og 2) temmelig underssetsig, mod stserkt opsvulmet seg- 
formig Porkrop og spinkel Bagkrop. • Den sidste er, naar 
Halevedhamgene fraregnes, noget kortere end den fprste. 
Integumenterne er sserdeles haarde og stserkt incru- 
sterede med Kalk, samt, naar afsees fra Lemmerne, naesten 
ganske npgne, uden Haar. 
Rygskjoklet er af smrdeles betydelig Storrelse, over 
dobbelt saa langt spin de frie Porkropssegmenter tilsammen 
og ogsaa, betydelig bredere end disse. med Gjelleregionerne 
stierkt opsvulmede. Seet fra Siden (Pig. 2) viser det sig 
bagtil hoit hvselvet eller ligesom puklet, fortil jevnt nedad- 
skraanende mod det saakaklte Rostrum og her ligesom ind- 
trykt i Midton. Frontallappen viser (se Pig. 1) den s red- 
van lige, noget klokkedannede Form og har langs ad Midten 
en utydelig Kjol. Det foran samme fremskydende, af de 
2 i Midtlinien sammenstodende Sidefliger dannede Frem- 
spring, der kun hoist uegentligt kan bemevnes Pandehorn 
eller Rostrum, indtager omtrent '/ s af Rygskjoldets Lmngde 
og er koniskt tilspidset samt horizontal! med Sidekanterne 
grovt tandede. Nedeuunder det saakaldte Pandehorn danner 
de frie nedre Ranter af Rygskjoklet (se Fig. 2) et stumpt 
tandet Hjorne og har lsengere bagtil et staerkt bugtet For- 
lob, med en stark Bpining omtrent paa Midten. 
Rygskjoldets Overflade viser overalt en meget ipine- 
faldende Skulptur i Form af talrige smaa Gruber, der giver 
den et elegant spsettet Udseende. Desforuden bemaerkes 
nsermere den dorsale Flade et Antal af svmetriske gruppe- 
rede storre knudeformige Fremspring, der er af stumpt til- 
rundet Form og ligesom polerede. Man tad lor ia.lt omtrent 
32 saadanne, hvoraf dog nogle er mindre tydelige. Mest 
ipinefaldende er til liver Side 8 stprre Knuder. der danner 
en nogenlunde regelimessig horizontal og noget liuet Rsekke 
strmkkende sig fra det saakaldte Pandehorn og bagover 
indtil det mest ophoiede Parti af Rygskjoklet. Begge disse 
Knudersekker begrsendser tilsammen et noget fordybet ovalt 
Felt, der forstorstedelen repraesenterer den saakaldte Mave- 
region ; bagenfor dette staar desuden til liver Side 2 lige- 
ledes tydeligt markerede Knuder, dannende sammen en re- 
gular Firkant (se Fig. 1). 
are furnished. The only example secured is. indeed, a male, 
whereas the specimen from which Heller worked out his 
description of D. spinuhsa, is a female; but the specimen 
described below being not yet sexually developed, there is 
no reason to infer that the sculpture should in any perceptible 
j degree deviate from that in the female. According to my 
researches, it is not till after the moult, which imme- 
diately precedes the sexually mature state, that the changes, 
frequently so remarkable, in the form and sculpture of the 
body characterising the males in Cumacea actually occur, 
— a circumstance that has previously led to the estab- 
lishment of several spurious species and genera. Hence, 
I am fully convinced, that, to the distinctive characters 
educed for the present species from its sculpture we can attach 
a real specific weight when comparing it with Heller’s species. 
Description. — The form of the body (see PI. YII, 
figs. 1, 2) comparatively thickset,, with the ceplmlo-thorax 
considerably swollen and ovate, and the abdomen slender. 
Excluding the caudal appendages, the latter is somewhat 
shorter than the former. 
The integuments are exceedingly hard and strongly 
incrusted with lime, as also, apart from the limbs, almost 
entirely naked, and without hair. 
The carapax is of very considerable size, more than 
twice as long as the free segments of the cephalo-thorax 
taken together, and also considerably broader, with the 
branchial regions much swollen. Yiewed from the side* (fig. 
2), it appears, posteriorly, high and arcuate, or, as it were, 
hunched, anteriorly shelving down toward the so-called 
rostrum, and there impressed in the middle. The frontal 
lobe exhibits (see fig. 1) the usual, somewhat bell-shaped 
form, and has, extending along the middle, an indistinct 
carina. The process generally termed the rostrum, jut- 
ting out before the lobe, and composed of the lateral 
lobules that meet on the medial line, measures about one- 
fifth of the length of the carapax; it is conically pointed 
and horizontal, with the lateral margins coarsely dentate. 
Underneath this rostriform projection, the free margins of 
the carapax (see fig. 2) form an obtusely dentate corner, 
and somewhat farther behind are exceedingly sinuous, with 
a strong curve about in the middle. 
The surface of the carapax exhibits everywhere a very 
conspicuous sculpture, with numerous small pits, giving it a 
curious speckled appearance. Moreover, in close proximity 
to the dorsal surface are seen a number of large, sym- 
metrically disposed, tuberculiform projections, obtusely rounded 
in form, and, as it were, polished. In all. may be counted 
32 such projections, some of which however are less dis- 
tinctly developed. The most conspicuous are 8 large protu- 
berances, on either side, constituting a comparatively regular 
horizontal and somewhat arched series, extending posteriorly 
from the so-called rostrum to the most elevated portion of 
the carapax. Both of these series of protuberances constitute 
together the boundary of a somewhat depressed oval area, 
representing the greater part of the so-called gastric region ; 
posterior to this area occur, moreover, on either side. 2 distinctly 
marked protuberances, that form a regular square (see fig. 1). 
