390 



In addition to the typical species described in the sequel, Boeck records another 

 species from the Norwegian coast, under the name of 8. Icevis. I have not, 

 however, seen any specimens of this form, and as the description given is rather 

 incomplete, being, in some points, not even in accordance with the generic 

 characters, and as, moreover, no figures at all are reproduced, I find it best, 

 at present, altogether to omit this form. Of exotic forms, 2 well-defined 

 species have been described by the Rev. Mr. Stebbing from the Challenger 

 Expedition, viz , S. p(ij>iif(-ca and 8. semiserrata. 



1. Syrrhoe crenulata, Goes. 



(PL 13G). 

 Syrrhoe crcnulcita, Goes, Crust. Am ph. inaris Rpetsb., p. 11, fig. 25. 



Body moderately slender, and nearly cylindrical in form, with the 

 posterior edge of last segment of mesosome and those of metasome coarsely 

 crenulated or serrated. Cephalon abont the length of the first 3 segments 

 of mesosome combined, and rather broad in its posterior part, front strongly 

 vaulted, with the rostrum perpendicularly deflexed and reaching beyond the 

 middle of the basal joint of the superior antennae, lateral corners but little 

 projecting, though acute at the tip. The first 2 pairs of coxal plates very 

 narrow and curving somewhat anteriorly, with the tip transversely truncated ; 

 3rd pair very much expanded distally, nearly securiform, the posterior edge 

 being deeply emarginated in its upper part to receive the 4th pair, and produced 

 below the emargination to a narrowly truncated lobe; 4th pair extremely 

 small, and somewhat curved; the 2 succeeding pairs slightly bilobed, with 

 the posterior lobe the larger. Penultimate pair of epimeral plates of 

 metasome produced at the lateral corners to a sharp recurved point; those of 

 last pair nearly rectangular, with the posterior edge strongly curved in its 

 upper part, and throughout coarsely serrated. Eyes completely coalesced, 

 forming a single large mass just within the dorsal face of the cephalon, visual 

 elements very numerous, pigment dark red. Superior antennae in female about 

 equalling in length l /s of the body, 1st joint of the peduncle scarcely longer 

 than the 2nd, but much thicker, and produced at the end posteriorly to a 

 dentiform projection, last joint somewhat shorter than the 2nd, flagellum a 

 little longer than the peduncle, and very slender, being composed of about 18 

 articulations, accessory appendage extremely narrow, and 3-articulate, with 

 the last joint very small. Same antennae in male considerably more elongated, 

 and having the 1st joint of the flagellum very large, and densely clothed 

 with sensory hairs, accessory appendage much larger than in female, and hav- 



