REPORT ON THE SCHIZOPODA. 



193 



author from the Mediterranean. The species of this genus would seem to lead a pelagic 

 existence, most of them being met with at the surface of tlic sea. 

 The following is a synopsis of the Challenger species : — 



Carapace with 

 posterior edge 



straislit. 



i 



emarginatc, 

 exposing 



Frontal plate abruptlj- truncate, 



A. lypiciis, Krdyer. 



the two posterior segments of trunk. Frontal 



plate triangular, acutely pointed at tip, . A. angustus, G. 0. Sars. 



none of the segments of trunk. Frontal margin 



only slightly projecting in the middle, . A. pusillue, G. 0. Sars. 



49. Anchialus typicus, Kroyer (PI. XXXIV. figs. 4-24). 



AiKihialuji fi/picug, Krtiyer, Et Bidrag til Kundskab om Krubsdyrfamilieu ilysida; ; Nat. 



Hist. Tidsskr., 2^'" Eaekke, Bd. i. p. 53, Tab. ii. figs. 7, a-l. 

 Mysis moebii, Dolirn, Untersuchuugen ilber Bau und Entwickelung der Arthropoden, II. ; 



Zeitschr. f. wiss. Zool., Bd. xxi., 1871, p. .359, Tab. xxvii., xxviii. figs. 11-22. 

 AneJiialus trunedtm, G. O. Sars, Preliminary Notices on the Challenger Schizopoda, No. 47. 



Specific Characters. — Form of body short and thit-kset. Carapace large, covering 

 whole of trunk, posterior margin straight. Frontal plate abruptly truncate at tip. Last 

 caudal segment a trifle longer tliau preceding. Eyes thick, claviform, cornea slightlj- 

 expanded, with light yello-ndsh pigment. Anteuuular peduncle short and stout, with 

 middle joint cup-shaped. Antennal scale exceedingly minute, rhomboidal, denticle of 

 outer corner obsolete. Gnathopoda very strong, with carpal joint in male projecting at 

 the inner edge as a pointed process. Legs comparatively short, with terminal part very 

 small, and divided into four to five articulations ; first pair in male having terminal part 

 dilated in the middle and armed with peculiar slender spines. Caudal limbs in female 

 distinctly developed on first segment only, those of male, strong, with basal lobe of inner 

 branch very broad, lamellar ; outer branch of fourth pair but slightly produced. Telf^on 

 very large, oblong linear, apical incision occupying one-seventh of the length. Uropoda 

 with inner plate somewhat larger than outer, and having the auditory aj^paratus but 

 slightly developed ; outer plate with exterior edge armed with a row of small denticles. 

 Marginal setae of both plates very small. Length, 9 mm. 



Remarks. — I recorded this form in my Preliminary Notices as a new species under 

 the name oi Anchialus tnincatus, but now believe it to be identical with the Anchialus 

 typicus of Kroyer. The figures given by that author do not, it is true, corresjjond 

 exactly with the form examined by m5-self ; but I think this may be merely accounted 

 for by the imperfect drawings given l)y Kroyer. His description would seem, for the 

 most part, to accord with the present species. I cannot but l)t'licv(' that tliL' I'nrni 

 recorded by Dohrn as Mysis ?)(oe6u belongs to this species. As regards the Mediterranean 

 .species, Anchialus agilis, G. 0. Sars, the similarity to the presi'ut form, both in the 



(zool. chall. EXP. — p.\RT xxxvii. — 1885.) Go 25 



