32 BULLETIN OF THE 



CRANGONID^. 



Ceraphilus Agassizii, sp. nov. 



Plate VII. Figs. 4-5". 



The carapax is short and broad, and in the female rounded and swollen above 

 and somewhat convex longitudinally. The rostrum (6, in figs. 4* and 5) is hid- 

 den from above by the anterior spine («) of the dorsal carina, and is slender, 

 spiniform, and scarcely if at all more prominent than the slender spine forming 

 the outer angle of the orbit each side, and very much .less prominent than the 

 slender and acute antero-lateral angles (tZ), which are slightly divergent and 

 reach a little by the bases of the antennal scales in the female, while they are 

 much more divergent and much longer in the male, so that the distance be- 

 tween their tips is considerably greater than the greatest breadth of the middle 

 portion of the carapax. A narrow dorsal carina extends the whole length of 

 the carapax, and is armed with two laterally compressed and spiniform teeth 

 directed forward, and of which the anterior is much the larger, projects im- 

 mediately above the rostrum, and reaches considerably beyond its tip, while the 

 posterior one is smaller and arises just in front of the cardiac region. There is 

 occasionally a very minute additional tooth in the dorsal carina about midway 

 between these two. On the gastric region either side of the dorsal carina there 

 is a large spine directed forward ; below this is a stout hepatic spine from the 

 upper side of which a prominent carinal ridge extends to near the posterior 

 border, while from its lower edge a similar ridge extends downward and back- 

 ward a short distance to the branchial region, where it meets a much less dis- 

 tinct carina extending from the antero-lateral angle nearly to the posterior 

 border. There is also a well-marked carina extending backward from the 

 orbital spine (c, figs. 4", 5, 5") along either side of the gastric region and fol- 

 lowing a distinct suture terminating anteriorly just outside the orbital spine. 

 The lateral margin of the carapax is strongly incurved, and projects inward in a 

 prominent rounded hibe below the base of the first thoracic leg. All the spines 

 of the carapax are proportionally longer in the male than in the female. 



The eyes are small and black, and scarcely reach beyond the tip of the 

 rostrum. 



The first segment of the peduncle of the antennula is more than twice as long 

 as the second, and the lateral process from its base is very long, and reaches as far 

 forward as the segment itself, which is armed with a tuberculifonn prominence 

 at the outer edge of the distal extremity and with a much smaller one on the 

 inner edge ; the second segment is short and has the outer distal angle con- 

 siderably produced ; the ultimate segment is much broader than long. The 

 flagella are subequal in length and in the female about as long as the peduncle, 

 but in the male about twice as long as the peduncle and the outer longer and 

 verv much stouter than the inner or than the outer flagellum of the female. 



