649 



'2. Protella phasma (Mont) 



(in. 234, lig. 1). 



Cancer pliasma, Montagu, Traus. lAn. Soc. Vol. VII, Ji. 66, PI. VI. fig. 3. 



Syn. Oaprella pliasma, Lam. 

 » — spinosa, Goodsir. 



> — acuminifera. Jolinst. 

 » jEgina longispiaa, Kr0yer. 



> Protella longispiua, Sp. Bate. 

 » iEgina phasma, Boeck. 



J — lievis, Boeck. 



Body rather narrow and elongated, with the cephalosome nearly as 

 long as the succeeding segment, and having 2 elongated, somewhat anteriorly 

 cnrving dorsal spines, the anterior one belonging to the cephalon, the pos- 

 terior to the 1st segment of mesosome; 2nd segment with 2 juxtaposed dorsal 

 spines somewhat in front of the middle and another at the end of the seg- 

 ment; the 2 succeeding segments exhibiting more or less distinct traces of a 

 similar armature to the above; the 3 posterior segments always smooth above. 

 Each of the free body-segments having on either side, just above the insertion 

 of the legs, a lateral spine, pointing anteriorly in the first 2 segments, in the 

 succeeding ones, posteriorly. Eyes comparatively small, orbicular, with dark 

 red pigment. Superior antennge extremely slender and elongated, even 

 exceeding in length the whole body, 2nd joint of the peduncle the longest, 3rd 

 joint about the length of the 1st, flagellum nearly as long as the peduncle, 

 and composed of numerous articulations. Inferior antennae considerably 

 shorter than the peduncle of the superior ones, and but sparingly setous, last 

 joint of the peduncle the longest, flagellum scarcely '/'' *s long as the latter. 

 Anterior gnathopoda very small, with the carpus but slightly expanded, pro- 

 podos about same length and oval in form, palm defined by a very slight 

 obtuse angle. Posterior gnathopoda strongly developed, basal joint long and 

 slender, terminating outside in an acute lappet, meral joint obtusely rounded 

 in front, propodos exceedingly large and oblong fusiform in oiitline, with the 

 upper edge somewhat arcuate and terminating in front, above the dactylus, 

 in a conical prominence, lower edge forming 2 distant acute lappets, the 

 posterior of which, defining the palm, is tipped by a small spine, and having 

 in front a broad, obtuse projection defined behind by a deep sinus, dactylus 

 strong, falciform. Antepeniiltimate pair of pereiopoda rather slender, with 

 the carpal joint longer than the propodal one, the latter rather narrow, with 

 a very slight angular prominence at the base carrying a single spine. The 



