72 BULLETIN OF THE 



ones are much the longer, while the proximal are like those upon the propodus, 

 which is armed with serrate setse somewhat as in M. Agassizii. 



The abdomen is a little more slender than in M. Agassizii, and the third, 

 fourth, and fifth somites are more conspicuously toothed, but none of the 

 somites are distinctly carinated except the third, which is strongly carinate, or 

 crested, and projects over the fourth somite in a very strong tooth, and the 

 fourth and fifth, which are anteriorly rounded above, and have a short carina- 

 like elevation at the base of the tooth. All the epimera are somewhat smaller 

 than in M. Agassizii, but similar in form to those of that species except that 

 the fifth has a distinct tooth in the postero-dorsal edge. The sixth somite is 

 fully twice as long as the fifth, twice as long as high, and strongly compressed 

 laterally. 



The telson is a little longer than the sixth somite, about as long as the 

 antennal scale, slender, and tapers to a long and slender tip armed either side 

 with six to eight spines, besides five or six pairs of dorsal aculei above the tip. 

 The lamellae of the uropods are almost exactly as in M. Agassizii. 



The inner ramus of the appendage of the first somite of the abdomen 

 (PI. XL fig. 4 b ) is a little more than a third as long as the slender normal outer 

 ramus, fully three times as long as broad, ciliated along the outer edge, the 

 inner edge straight, and projecting slightly distally, where it is armed with the 

 usual hooklike spines for holding together the appendages of the two sides of 

 the animal. The inner ramus of the appendage of the second somite bears the 

 usual two stylets (PI. XI. fig. 4°), but the secondary stylet, specially character- 

 istic of the male, is rudimentary, only about a fifth as long as the other, is 

 terminated with a single long seta, and undoubtedly indicates that the speci- 

 men is immature. 



The surface of the carapax and abdomen is naked, but thickly and conspicu- 

 ously punctated. 



The branchial formula is apparently the same as in M. Agassizii. 



The Bingle specimen is from Station 328, N. Lat. 34° 28' 25", W. Long. 

 75° 22' 50", 1632 fath., and gives the following measurements : — 



Sex <? 



Length from tip of rostrum to tip of telson 44.0 mm. 



" of carapax including rostrum 20.0 



" of rostrum **»0 



" of antennal scale 6.0 



Breadth of " " 16 



Length of sixth somite of abdomen 6.5 



Height of " " " 2 - 7 



Length of telson 6 -° 



This species is perhaps not congeneric, or consubgeneric, with M. Agastimi, 

 but it seems best to refer them both to the present genua until their relation! 

 to the typical Mediterranean ipecacs oiMitnia can be better dete rm i n ed. 



The form and dentition of the rostrum of Mi< nia giueilit appear to be much 



