CRUSTACEA MALAD >STRACA. 



39 



Remarks. S. I. Smith founded .1/. similis on a single female, in which the carapace (with 

 rostrum) was 2.1/2 mm. long; he states that it "is very closely allied to .1/ crassa, and will possibly 

 prove to be a variety of it", but of M. crassa he had only seen his type-specimen, a very large female, 

 in which the carapace with rostrum measured 65 mm. My single specimen, a female with eggs, 

 stands nearer to M. similis than to -1/. crassa, but is somewhat larger than the former, as the cara- 

 pace with rostrum is 40 mm., the rostrum itself I2'4 mm., and it differs from both and especially from 

 M. crassa in that the rostrum is longer, narrower and more curved upwards and in that the spiny 

 armature along the anterior margin of the carapace is reduced to but a single process outside the 

 basis of the antenna?. The gastric area has two larger and five smaller spines as also a number of 

 granules and on the posterior half a number of smaller, flat tubercles; the hepatic area has some 

 smaller, round tubercles; on the posterior half of the carapace there are numerous raised portions 

 which have a certain resemblance to transverse keels and are from three to more times as long as 

 broad. The rostrum is strongly recurved, narrow in its distal two-thirds, upper margin keeled, under 

 side flat and lateral margins with three to four serrations at the middle. The antero-lateral process 

 on the carapace is of good size, another but smaller process is present about halfway between this 

 and the basis of the antenna and between this and the rostrum the anterior margin is smooth; the 

 lateral margin has some smaller spines, one or two of which are situated on the anterior angle of the 

 posterior branchial area. The furrows between the different areas of the carapace are well-marked 

 and smooth. The eyes, antennules and the limbs on the cephalothorax agree with the corresponding 

 parts of M. similis in the features in which S. Smith finds differences between this form and J/, crassa. 

 The abdomen is essentially intermediate between those in ill. similis and AI. crassa. For the rest, my 

 figures show all these features in my specimen. 



The eggs are ca. 3 mm. in diameter. — Just after the specimen came up in the trawl, I noted 

 that it was uniformly white with yellowish red eyes, while the eggs were bright scarlet red. 



As a result of the above I have considered myself justified in referring my specimen to 

 M. similis Smith; so long as it cannot be determined with certainty that this species should be in- 

 cluded under J/ crassa as a variety or only as a synonym, I have thought it best to keep the first 

 name. Under "distribution" I have further expressed my views concerning M. crassa, M. similis and 

 M. subsqitamosa var. aculcata Hend. 



30. Uroptychus nitidus A. M.-Edw. var. concolor A. M.-E. 



1888. Diptychus nitidus A. Milne-Edwards, Bull. Mus. Comp. Zool. Vol. VIII, p. 62. 



1894. — , var. concolor, A. Milne-Edwards & Bouvier, Ann. Sc. nat, Zool., Ser. 7, T. 16, 



p. 225, fig. 16, fig. 21. 

 ! 1900. A. Milne-Edwards & Bouvier, Exp. Scient. du Travailleur et du 



Talisman, Crust. Dec, I., p. 360, PI. IV, fig. 4, PI. XXXII, figs. 15— 19. 

 Occurrence. The "Ingolf" has brought home a single specimen. 

 South-West of Iceland: St. 84: 62 58' N. L., 25 24' W. L., 633 fm., temp. 4-8°; 1 spec. 

 Distribution. The species was first taken by the "Blake'', later by the "Challenger" at the 



