504 MR. C. SPENCE BATE ON NEW CRUSTACEA. [NoT. 24, 



ing at the fifth segment. The posterior pair of pleopoda are not longer 

 than the telson, which is narrow and tipped with two long hairs. 

 This species was taken at the same time and place as the preceding. 



The following species is sufficiently distinct in its organization from 

 Idotia to induce the construction of a separate genus for its reception. 



Crabyzos, nov. gen.* 



Cephalon et pereion ceque angusta, segmento prima pereii cum 

 cephalo covjuncto. AntcnncB superiores non lotigiores quam ce- 

 phulon. Antennas inferiores admodum longiores quam supe- 

 riores. Pereiojjoda simplicia, dactylis in duos denies tei-minan- 

 tibus ; omnia 2iereiopoda post primum 2icir tenuia et brevia. 



The animal is long and slender, the pereion not heing broader than 

 the ce^halon. The first joint of the pereion is fused with the ce- 

 phalon ; the superior antennee are not longer than the cephalon ; the 

 inferior are much longer than the superior. The first pair of pereio- 

 poda are tolerably robust and long, the rest are short and feeble, and 

 all terminate in a double-toothed apex to the dactylos. The pleon 

 is slightly narrower than the pereion, and has all the somites formed 

 into a single joint ; the pleopoda are protected by opercula. 



Crabyzos longicaudatus. (PI. XLI. fig. 7.) 



Pleon in cuspidem longam terminans, segmento pritno et cephalo 

 cequis ; antenncB superiores breviores quam cephalon ; antennce 

 inferiores tarn long<x quam pereii segmentum secundum. 



The cephalon and first joint of the pereion are of equal length ; 

 the others gradually decrease in length posteriorly ; the dorsal sur- 

 foces are nearly flat, while the margins with the coxee stand nearly 

 ])erpendicular to them. The pleon gradually narrows posteriorly, 

 where it terminates in a long cusp or point. The eyes are round and 

 prominent, and placed near the latcro-anterior margins. The supe- 

 rior antennse are shorter than the cephalon. The inferior antennae 

 are about four times as long as the superior, and reach to the extre- 

 mity of the second somite of the pereion. The first pair of pereio- 

 poda are tolerably robust and long ; all the others are shorter and 

 more feeble ; all terminate in double-pointed dactyli, which form 

 with the propodi prehensile organs. The pleopoda are enclosed 

 within two laterally attached opercula. 



The animal is described as being of an apple-green colour, darker 

 along the line of the primse viee, and covered with numerous minute 

 spots over the surface generally. 



Three specimens were taken, one of which is ^ inch long, the 

 other two being scarcely more than 1 inch — a circumstance probably 

 dependent upon sexual distinction. 



These were taken at the same time with those previously described. 



* Deriv. irpa^vZ,o?, a little shellfish. 



