10 FIGURES AND DESCRIPTIONS OF 



Antennulary ring v^itli the antcro-lateral angles more strongly spinose than in 

 any other species. 



Carapace with the spines at the antero-lateral angles stronger, incurved, reach- 

 ing nearly to the level of the rostro-carapacial suture. 



Outer ends of the fifth thoracic tergum produced to a somewhat forwardly- 

 curved and acute lobe, beneath which, on each side, is an acute ridge surmounted 

 by a sharp mucro, much as in S. scorpio. 



Outer ends of the sixth and seventh thoracic terga sinuous, the posterior angles 

 rounded and the anterior produced into sharp triangular spines. Outer ends of the 

 eio-hth thoracic tergum concave, with both angles, but especially the anterior, pro- 

 duced and acute. 



Lono-itudinal ridges of the free thoracic and of the abdominal terga as in 

 C. Latreillei, except that the marginal ridges of the abdominal terga are distinct, 

 that the submedian ridges of the second free thoracic tergum are present, that the 

 vestiges of a median ridge on the four intermediate abdominal terga are more pro- 

 nounced, and that the submedian ridges of the abdominal terga are more divergent 

 posteriorly, especially those of the fifth. The surface between the submedian and 

 sublateral ridges is in all the thoracic and abdominal terga distinctly indented and 

 hence uneven, and in the last two abdominal terga rugose, especially in the last. 



Telson scabrous, vermiculated above and below, with coarsely granulated ridges, 

 which are much more numerous complex and constant on the dorsal surface. On 

 the dorsal surface, which is uniformly covered, there may be recognized, amongst 

 others, the submedian lanceolate figure (which may be recurved at both its basal 

 ends so as to form a V), the dorsal ridges of the marginal spines, and the three 

 rido-es between the submedian and sublateral marginal spines already described in 

 C. Latreillei. On the ventral surface of the telson, on either side of the long post- 

 anal crest, there are more or less numerous shorter or longer somewhat irregular and 

 broken longitudinal lines of granules. The marginal spines are exceedingly short 

 and salient ; the sublaterals are by far the longest of the three ; while the laterals, 

 though not much longer than the submcdians, are much more slender and acute 

 than these : the submedians end in movable spinules. The number of spinules 

 intervenino- between the submedians appears to be variable ; between the submedians 

 and sublaterals there are seven, the inner of which are nearly as distinct as the 

 submedian itself ; and there is one, as usual, between the laterals and sublaterals. 

 The ventral crest of the lateral marginal spine is complete. The spinous prolonga- 

 tion of the base of the swimmeret may be armed on the inner margin with as 

 many as twelve slender conical spinules. 



The terminal joint of the great raptorial limbs is slender, is armed with five 

 spines on the inner margin, and is notched near the base of the outer margin. 



