402 Pr. J. 0. (le l\Tan 07? 



Al domen rcpcnibliiio: in general appearance tliat of 

 Cr. vuJ(^ar>s. Tlie first to third segments rounded above, 

 fourth segment presenting a trace of carination along a very- 

 short distance on the posterior half; Ji/th segment distinctly 

 connate : sixth resembling that of Cr. vulgaris, but its upper 

 border has a shallow medi;in groove; as in Cr. vulgaris, it is 

 sulcate beneath. Telson almost once and a half as long as 

 the sixth segment, just as long as the carapace, faintly 

 grooved above, terminating in a sharp tooth, on each side of 

 ^Yhich three movable spinules are inserted. 



Inner antcnnular flagcUum exceeding somewhat the antennal 

 scale, outer flagellum reaching to the end of the blade. 



External antennae as long as the body. The scale, 

 mca-uved along its straight outer margin, appears to be four 

 ffths the length of the carapace exclusive of the rostrum ; it 

 resembles that of Cr. aUiskensis, but it is only three times as 

 long as broad ; end of the blade rounded, not produced at the 

 antero-internal angle and much broader than the spine at this 

 level : spine extending as much beyond the blade as the tip 

 of the latter is broad. 



External maxillipedcs reaching to the end of the blade. 

 Chela3 of first pair almost four times as long as broad, a Utile 

 slenderer than those of Cr. ala.shensis ; obliquity of the 

 terminal margin in both species the same. 



A single egg-laden female, 48 mm. long, from the Inland 

 Sea of Japan, deep water. 



Crangon casst'ope, sp. n. 



In its outer appearance much resembling Crangon vulgaris, 

 Fabr., but distinguished by the sixth segment of the abdomen, 

 which is convex, not sulcate beneath, so that this species is 

 also related to Cr. alba, Holmes, and Cr. Holmesi, iiathb."''', 

 from the north-west coast of North America. 



Carapace of egg- bearing iemale, rostrum included, a little 

 longer than one tliird of abdomen. Viewed from above this 

 species most closely resembles Cr. vulgaris, but the numerous 

 small dark spots on carapace and abdomen are almost 

 wanting. All the segments of the abdomen are rounded 

 above, but neither the sixth nor the seventh shows any 

 tendency to become flattened or grooved, as sometimes takes 

 place in the common shrimp. Ventral surface of sixth 

 segment rounded and convex in the middle ; at the posterior 

 end a sulacute conical tubercle instead of the sharp spine of 

 Cr. vulgaris. 



* Rathbun, /. c. pp. 117 & 118. 



