CRUSTACEA MALACOSTRACA. 23 



small tubercles. The rostrum is short and has the usual three smooth processes, the form and direction 

 of which offer nothing- of interest. The gastric area is greatly arched, marked posteriorly by a deep 

 cervical furrow from the cardiac area; on the gastric area are 7 very apparent spines, namely, one 

 unpaired long and strong spine in front of the central portion and 3 pairs somewhat shorter but yet 

 good-sized spines out towards the lateral margins, and also some small spines and a number of very 

 small tubercles. Each hepatic region has two long marginal spines, the first of which is on the an- 

 terior corner, as also some small tubercles; the considerably arched cardiac area has 4 good-sized 

 spines. The lateral margin has 4 to 5 good-sized and several smaller spines behind the cervical furrow; 

 along the posterior margin are 4 to 6 somewhat low and also some minute spines. 



The eye-stalks touch one another at the base; they bear some small tubercles or spines on the 

 upper side. The stalk of the antennae reaches almost to the middle of the last joint of the peduncle 

 of the antennula; its first joint (fig. 3 b) has a short spine on its outer anterior corner; the spine on the 

 front corner of the second joint reaches forward in front of the middle of the squama and at its base 

 the outer margin sometimes has a tubercle. The squama (figs. 3 b, 3 c, 3 d) has as a rule two processes 

 on the proximal -' 5 -ths of its outer margin, the distal one being as a rule fairly long, much longer 

 than the proximal which is short usually but may also at times be longer than the distal or lacking 

 altogether; above on the inner margin, the squama has as a rule a tubercle or short spine near its 

 base and in one of the specimens further a rather long distal spine on the left squama. The flagellum 

 is as long as or even a little longer than the distance from the tip of the longest process of the 

 rostrum to the posterior margin of the cephalothorax. Between the last pair of maxillipeds the sternum 

 has two tufts of bristles but no spines. 



The first leg on the right is a little longer and considerably thicker than that on the left, the 

 chela especially is much heavier; the meropodite has a single, very long spine on the inner side at 

 the anterior end; the carpus has a similar very long spine on the inner side and on the upper side 

 out towards the lateral margin several fairly long and some shorter spines. The three pairs of walking 

 legs are long with the larger spines placed in rows; the front upper margin of the carpus has 3 long 

 and 3 short or very short spines. 



The second segment of the abdomen (figs. 1 a and 1 b) has only short or even fairly short, 

 setigerous spines and several small spines or protuberances. No row of protuberances between the 

 median plates of the 3 rd — 6 th segments. In the large male (fig. 1 a) the right lateral plate of the 3 rd 

 segment has a single, lateral, movable plate, the left none at all; in the small male the right lateral 

 plate of the same segment has two movable lateral plates, the left lateral plate one; in the females 

 (fig. 1 b), there is no movable lateral plate on the right lateral plate of either the third or fourth segment. 



Measur ements. The largest specimen, a female with I st pair of legs broken off, has the 

 following- dimensions. 



Length of cephalothorax to tip of longest process of rostrum .... 54-5 mm. 



— - base of rostrum 45-5 — 



Breadth - 46 — 



Length of second right walking leg, on under side 119 — 



— - — — — — - upper — 114 



*& 



