mod Spiserøret, at dette netop faar Plads til at passere 
dem. - Paa Radialstykkets indvendige Flade er en smal, dyb 
Fure for Radialkarret. Tia 
Interradialstykkerne 
fremragende Kam, Fig. g, der har en lignende Knude 
som den, der er omtalt ved Radialstykkerne; fortil ender 
denne Kam i en temmelig lang Spids; imellem denne og 
Radialspidsen er et halvmaaneformigt Indsnit, Fig. 27, h. 
Paa hver Side af Kammen er en dyb Fure, Fig. 27, 2 
der afsluttes ved de tilstødende Radialstykker, og som tje- 
ner til at optage en Ampulle. Hvert Interradialstykke har 
saaledes 2 Ampuller og hvert Radialstykke 1. 
Ampullerne, Fig. 26, b, b, ere yderligere befæstede 
ved et Ligament, som gaar fra den ene Kamknude til den 
anden. Kalkringens forreste Rand har 15 Spidser og lige- 
saa mange Indsnit. 
end de øvrige. 
Man vil af denne Beskrivelse, sammenholdt med den, 
der af os er given over Kalkringen hos Tr. Thomsonii, 
finde, at Jeffreys? Kalkring adskiller sig fra denne væsent- 
lig ved sine stærkt fremspringende Kamme, ved Knuderne 
paa samme og ved de dybe Ampullefurer. 
Interradialspidserne ere meget længere, 
Vandkarringen slutter sig tæt til Spiserøret og ud- 
sender sine 5 Hovedstammer, der dele sig ligesom hos Tr. 
Thomsomii. Den Poliske Blære er temmelig stor, 
og forsynet med en lang Stilk, Fig. 15, g, 26, c. 
»gformig 
Stenkanalen er ved sin ydre Ende fæstet til den indre 
Kropsvæg, løber langs Kjønsorganernes Udførselskanal, og 
omtrent 0.57” fra Befæstningspunktet har den en Madre- 
porplade, Fig. 15, 7, 16, 
enkelt Omslyngning af Kanalen, 
synkning, Fig. 18; hos ældre er den mæneandrisk, ‘Fig. 16, 
17. Stenkanalen er omgivet af Kalkfletninger fra dens 
Fæstepunkt i Huden til noget over Midten, den inderste 
Trediedel er fri for Kalk. Paa et Exemplar, det største, 
vi have havt til Undersøgelse, var Stenkanalen delt i to 
Grene, der hver med sin afrundede Ende fæstede sig i 
Corium, Fig. 16. 26, g. Strax indenfor Delingen sad 
Madreporpladen med sin mæneandriske Overflade. 
der hos yngre Dyr dannes af en 
i hvis Midte er en Ind- 
Saavel 
Stenkanalen som Madreporpladen var bygget paa samme 
Maade som hos Tr. Thomsonti, hvortil vi henvise. 
Blodkarsystemet, ligesom Nervesystemet, afviger ikke 
fra disse Systemer hos Slægten Trochostoma. 
Kjønsorganet er fæstet til det dorsale Mesenterium 
og bestaar af to korte Stammer, der forene sig til en fælles 
Udførselsgang, som er meget lang, og som udmunder i den 
tidligere omtalte Papille paa den forreste Del af Dyrets 
Ryg. Den ene Stamme er lidt længere end den anden; 
men fra begge udgaa yderst faa aflange blæreformige Ud- 
vidninger, der hos de Individer, vi undersøgte, vare udfyldte 
af mere eller mindre udviklede Æg, Fig. 15,:h. 
have paa den ydre Flade en. 
70 
rapidly inward towards the æsophagus as barely to leave 
space for its passage. On the inner surface of each — 
radial segment is seen a narrow and deep groove for the 
reception of the radial vessel. | 
The interradial segments have on their outer surface a 
projecting comb, fig. 27, g, exhibiting a protuberance simi- 
lar to that on the radial segments; anteriorly, this comb ter- 
minates in a comparatively elongate point, and between the 
latter and the radial point is seen a lunate incision, fig. 
, h. On either side of the comb extends a deep groove, 
fig. 27, 7, bounded by the contiguous radial segments, and 
which serves for the reception of anampulla. Hence, each 
interradial segment has 2 ampullee, and each radial segment 1. 
The ampulle are further attached by a ligamen- 
tous filament, extending from one pectinate protuberance to 
the other. The anterior margin of the calcareous ring has 
15 points. and as many incisions. 
are much longer than the others. 
On comparing this description .with ‘that we have 
giv en of the calcaréous ring in Troch. Thomsonii, the chief 
distinctive features of that organ in Ankyr. Jeffreysi are 
found to be the projecting combs, the pectinate protube- 
rances, and the deep grooves for the reception of the 
ampullæ. 
The interradial points 
and 
in 
The water-vascular ring adjoms the æsophagus, 
from it spring 5 columnar stems, which divide, 
Troch. Thomsoni. The vesiele of Poli is rather 
ovate. and furnished with a long pedicle, figs. 
26, c. ‘ 
The sand-canal is webbed at its outer extremity to 
the inner wall of the body. and accompanies the eferent 
duct of the generative organ; about 0.57” from the point 
les) ld, ae ls 
formed in immature examples by a single circumvolution 
of the canal, with a depression in the middle, fig. 18; 
mature individuals it is sinuous, figs. 16; 17. The 
sand-canal is surrounded by calcareous reticulations from 
the point of attachment ‘in the skin to a little beyond 
as 
large, . 
UD, G5 
of attachment it has a madreporic body, 
in 
the middle; the inner third has no calcareous deposit. 
In one of our examples — the largest — the sand-canal 
was divided into two branches, each with its rounded 
extremity attached to the corium, figs. 16; 26, g. Imme- 
diately within the line of division occurred the madreporic 
body, with its meandrian surface. The structure both of 
the sand-canal and fhe madreporic body was precisely the 
same as in Troch. Thomsoni. 
The circulatory system and the nervous system differ 
in no wise from those systems in the genus Trochostoma. 
The generative organ is webbed to the dorsal mesen- 
tery; it consists of two short stems, which unite to form a 
common eferent duct, exceedingly long, and opening into 
the papilla, previously described, on the anterior part of 
the back. One of the stems is somewhat longer than the 
other; and from both proceed a very few oblong vesicular 
expansions, which in the specimens examined were full of 
ova, more or less mature, fig. 15, h. 3 
