51 



tæt børstebesatte Led. Det midterste Halevedbæng næsten 

 qvadratisk, kun lidet længere end bredt, med Sidekanterne 

 i den bagre Halvpart forsynede med smaa Torner; det 

 bagre Indsnit bredt, vinklet, med Kanterne rint saugtakkede; 

 Endelapperne tilspidsede og bevæbnede med en enkelt apical 

 Torn. De ydre Halevedhængs indre Plade kortere end den 

 ydre og langs den indre Kant under Randborsterne tæt 

 tandet. Hele Legemet gjennemsigtigt, af hvidagtig Farve, 

 uden Spor af Pigmentering. 



Findesteder. Stat. 295, 297. 



Bemærkninger. Den i min Prodromus givne Dia- 

 gnose er kun affattet efter det under vor Expedition tagne 

 enkelte Exemplar, ]iaa hvilket forskjellige i systematisk 

 Henseende vigtige Dele manglede eller var ufuldstændige. 

 Længe efter Expeditionens Afslutning og efterat nærværende 

 Afhandling allerede var paabegyndt, blev imidlertid af R. 

 Collett i Ventrikelen ai den mærkelige nye Dybvandstisk, 

 Bhodichthys regina, Coll., fundet Levningerne af et andet 

 Exemplar af samme Art, paa hvilket saavel Antennebladene 

 som samtlige Fødder var i Behold. Jeg har herved i en- 

 kelte vigtige Punkter kunnet supplere min tidligere Char- 

 acteristik af nærværende interessante Myside og har paa 

 sidste Planche vedføiet de fornødne Figurer. 



Beskrivelse. Da begge de foreliggende Exemplarer. 

 som ovenfor bemærket. er i en stærkt mutileret Tilstand, 

 bliver det temmelig vanskeligt med Sikkerhed at bestemme 

 Legemets almindelige Form. Den synes imidlertid, efter 

 de erholdte Levninger at dømme, at have været forholdsvis 

 undersætsig og nærmest lignende samme hos Arterne af 

 Slægten Mysideis, G. 0. Sårs. 



Rygskjoldet er forholdsvis stort og synes fuldstændigt 

 at have dækket Forkroppen. Det er fortil (se Pl. V, Fig. 

 13, og Pl. XX. Fig. 18) betydelig bredere end Bagkroppen 

 og viser foran Midten en tydeligt markeret buet Cervical- 

 fure. Pandedelen springer stærkt frem og er i Midten ud- 

 trukken i en skarp tilspidset, rostrumlignende Fortsats. der 

 rækker næsten til Midten af Iste Par Føleres Basalled. 



Øinene (ibid.) er ganske og aldeles rudimentære, kun 

 dannende et Par skraat udadrettede, stumpt koniske Fort- 

 satser, uden det mindste Spor af Pigmet eller Synselementer. 

 Yed den stumpt tilrundede Ende. der ikke rækker ud 

 over Rygskjoldets Sidekanter, tindes fortil et lidet tand- 

 formigt Fremspring. 



Iste Par Føleres Skaft (ibid.) er temmelig kraftigt 

 bygget, cylindriskt og omtrent af samme Længde som Ryg- 

 skjoldets Brede fortil. Af dets 3 Led er Iste og sidste 

 omtrent lige store, medens det 2det er ganske kurt. 



Svøberne var vistnok paa begge Exemplarer incom- 

 plette; men efter det bevarede basale Parti lader sig dog 

 slutte, at de har været af temmelig betydelig Længde. 



2det Par Føleres Blad var paa det ene større Ex- 

 emplar (Pl. V, Fig. 13) paa begge Sider defect. idet den 

 ydre Del var afbrukket. Derimod var det paa det andet 

 mindre Individ (Pl. XX. Fig. 18) uskadt og forsynet med 



and divided into 7 or 8 short articulations, densely beset 

 with bristles. Telson well-nigh quadrate. but very Little 

 longer than broad, armed in the posterior half with small 

 marginal denticles; posterior incision broad. angular. with 

 the edges finely serrate; the terminal lobes pointed and 

 armed with a single apical spine. Inner plate of outer 

 caudal appendages shorter than outer, and, along the inner 

 margin, closely dentate beneath the bristles. Whole body 

 translucent, and whitish, without any trace of pigment. 



Locality. — Stats. 295, 297. 



Remarks. — The diagnosis given in my Prodromus 

 was worked up exclusively trom the solitary specimen tåken 

 on the Expedition. in which however several systematically 

 important parts were either entirely wanting or incomplete. 

 Long after the close of the Expedition. and after the present 

 Memoir had been commenced. Mr. R. Collett found in the 

 ventricle of the remarkable deep-sea fish, ffliodicMhys regina, 

 Coll., the remains of another specimen of the same species. 

 in which both the antennal scales and all the feetremamed 

 intact. Hence, I have, with regard to several important 

 points. been enabled to supplement my original characteristic 

 of this interesting form, and on the last plate have annexed 

 the necessary figures. 



Description. — Both of the specimens secured being. 

 as mentioned above, in a very mutilated condition. it is a 

 matter of some difficulty to determine the general form of 

 the body. This, however, judging from the remains found 

 on the Expedition and by Mr. Collett, would appear to be 

 comparatively thickset, approximating closest tbat in the 

 two species of the genus Mysideis, G. O. Sårs. 



The carapax is comparatively large, and would appear 

 to entirely cover the cephalo-thorax. Auteriorly (see Pl. V, 

 fig. 13, and Pl. XX, fig. 18), it is much broader than the 

 posterior division, and exhibits, anterior to the middle, a 

 well-defined. arcuate cervical groove. The frontal part juts 

 prominently forward, and is drawn out as a sharp-pointed. 

 rostrum-like projection, reaching almost to the middle of 

 the basal joint of the Ist pair of antennæ. 



The eyes (ibid.) are in every sense rudimentary, form- 

 ing merely a pair of obtuse. conical prolations. directed 

 obliquely outward. without the slightest trace of pigment 

 or visual elements. At the obtusely rounded extremity, which 

 does not reach above the lateral margins of the carapax, 

 occurs anteriorly a small dentiform projection. 



The peduncle of the Ist pair of antennæ (ibid.) com- 

 paratively powertul in structure. cylindric. and about as long 

 as the carapax is broad anteriorly. Of its 3 joints, the 

 first and last are about equal in size. while the second is 

 exceedingly short. 



The flagella were in both specimens. incomplete; but. 

 judging from the basal portion, their length may be inferred 

 to have been considerable. 



The scale of the 2nd pair of antennæ was in the 

 larger example (Pl. Y. fig. 13) on either side defective. the 

 outer portion having been broken off. In the smaller spec- 

 imen (Pl. XX, fig. 18). it was wholly uniujured and 



