152 

 Genus Dynameno'psis, new gen. 

 Dynamenopsis obtusa, n. sp. 



Plate A'ii., figs. 11 to 17; and plate viii., figs. 1 to 7 



The body is smooth, except on the pleon, which is rather 

 rough, glabrous, very convex, becoming slightly wider at the 

 end of the thorax. 



The head is anteriorly rounded, without a transverse 

 anterior ridge, longer than the first segment of the thorax. 

 The €yes are rather small. 



Of the segments of the thorax the first and seventh ar© 

 longer than the rest, and subequal in length. The seventh 

 almost completely covers the anterior portion of the pleon; 

 its posterior border has four short lobes, the two median 

 ones projecting somewhat behind. The epimeral plates of 

 the thoracic segments are vertical in direction; that of the 

 first segment is well produced anteriorly, but posteriorly very 

 little; the following four are subquadrate; that of the sixth 

 is wedge-shaped and produced behind, more than overlap- 

 ping that of the seventh segment and the lateral portion of 

 the anterior part of the pleon. 



The posterior portion of the pleon is dome-shaped, and 

 has a conical tubercle each side of the median line, with a 

 smaller one posteriorly just above the posterior notch. The 

 posterior notch is a transversely-ovate foramen, a closed slit 

 below forming a funnel-shaped tube, the two sides form a 

 small notch at the immediate end, while the sides of the 

 pleon are turned under, enclosing the pleopods much more 

 than is usual. 



The first joint of the antennulary peduncle is not very 

 broad ; it is about twice as long as the second, and is with- 

 out distal notch or produced angle. The second joint has a 

 slight keel ; the third joint is as long as the second, expand- 

 ing a little distally. The flagellum is as long as the last two 

 joints of the peduncle together, and has 8 short joints. The 

 antennal peduncle is only a little longer than that of the 

 antennule; its flagellum has 11 joints. 



The anterior part of the epistome is not separated from 

 the depressed rostral projection; this fits into a notch of the 

 epistome with a sutural line marking the union, the whole 

 being in the same curved surface with the front of the head. 

 The labrum is quadrate. 



The mandibles are abnormal, without distinct incisory 

 plates, secondary plate, and spine rows, neither is there a dis- 

 tinct molar, but the part corresponding to the posterior edge 

 of the molar bears a few brown recurved spines. 



The maxillipeds are rather slender. 



