366 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



long as that segment in the male. It is provided with rather coarse 

 tubercles in front, which are arranged transversely in three rows, and 

 behind the third row is a deep transverse groove, behind which the tu- 

 bercles are less prominent and more of the character of granulations. 

 On each side before the middle is a prominent, sub-acute tooth, directed 

 outward and backward immediately above the articulation of the uropods. 

 The tip of the pleon is not spiuiform, but only slightly attenuated and 

 obtuse. The pleopods are delicate in structure, and the anterior pairs 

 are ciliated. The uropods or opercula are more than nine-tenths as long 

 as the under surface of the pleon (pi. VIII, fig. 48 c), but cannot be seen 

 from above. They consist on each side (pi. VIII, fig. 51) of an elongated, 

 semi-oval, basal, lamellar segment, thickened and vaulted externally, with 

 the anterior end rounded, and bearing a salient semi-circular process on 

 the outer margin near the anterior end, for articulation with the pleon. 

 Posteriorly this plate is tapering and it is broadly truncated at the tip, 

 where it bears two lainelliforin rami. Of these the external is thick, 

 like the basal segment, and is of an elongate triangular form and com- 

 pletes the operculum behind, while the inner ramus is a small and 

 delicate oval plate, articulated to the basal segment near its inner distal 

 angle, and completely covered and concealed by the outer ramus when 

 the operculum is closed. The inner ramus is sparingly ciliated at the 

 tip. The pleopods are very delicate, and the anterior pairs are ciliated 



In the females the lamella forming the incubatory pouch are thick- 

 ened and tuberculated or granulated along the outer edge where they 

 are attached to the segment. The thickened area is bounded by a lon- 

 gitudinal ridge, beyond which the lamella is thin, smooth, and translu- 

 cent, permitting the eggs to be seen through it, and the thin portion of 

 the right lamella (in the specimen examined) overlaps its fellow of the 

 opposite side so far as to bring its edge along the base of the ridge bound- 

 ing the thickened portion of the opposite lamella. Near the anterior 

 end and on the outer side is a rounded lobe in the margin of the lamella 

 for articulation with the segment. 



Length of female 10 mm ; male ll mm ; diameter of fourth thoracic seg- 

 ment, female 1.2 mm ; male 0.52 mm ; color in alcohol, nearly white. 



This species was described by the writer without having seen Sars' 

 description of LeacMa granulata. The volume containing his description 

 has since been obtained by the Yale College Library, and a careful com- 

 parison of our specimens with his description leaves little doubt that the 

 species is identical with his. His specimens were somewhat larger than 

 ours, females measuring 14 mm and males 17 mm . The females in A. lonyi- 

 cornis Sowerby are much larger than the males, and the reverse rela- 

 tion of size in this species appears to be unusual in the genus. 



Specimens were first collected on this coast on George's Bank !, in the 

 summer of 1877, and the three then obtained were found adhering to 

 Primnoa, and had been dried and somewhat broken. Better specimens 

 were collected adhering to the cable of the schooner ' Marion,' at Ban- 



