No. 1633. SOME NEW ATLANTIC ISOPODA— RICHARDSON. 



79 



Fig. 10. — JANIREL- 

 LA LOBATA. SEY- 

 ENTH LEG OP 

 FEMALE. 



produced in five rounded lobes, which occupy the anterior two-thirds 

 of the length of the segment ; below the last lobe the 

 lateral margins are straight and converge to an acute 

 triangular extremity, the apex of which is rounded ; 

 this triangular extremity occupies one-third of the 

 length of the segment; on the dorsal surface of the 

 abdomen, about one-third the distance from the an- 

 terior margin are two prominent tubercles, one on 

 either side of the median longitudinal line. The 

 uropoda are placed below the last lateral lobe, and 

 are bi-articulate, consisting of two small subequal 

 articles. The legs are alike in both sexes. The first 

 pair are stouter than the following which are all am- 

 bulatory and furnished with uni-unguiculate dactyli. 



Ten specimens of this species, three males and 

 seven females, are from southeast of Georges Bank. 



Three specimens come from Station 2571, steamer Albatross, taken 

 at a depth of 1,356 fathoms, one from Station 

 2572, taken at a depth of 1,769 fathoms, and 

 six from Station 2573, taken at a depth of 1,742 

 fathoms. 



The type, from Station 2571, is in the U. S. 

 National Museum, Cat. No. 38967. 



In some of the smaller and younger speci- 

 mens the smaller lobes are not distinct, and 

 seem to be fused, but in general character they 

 resemble the type as described. 



This species differs from Janirella nanseni 

 Bonnier in having the lateral processes wider 

 and more rounded like lobes than spine-like as 

 in that species, in having the base of the ros- 

 trum not dilated as in that species, in having two spines on all the 

 thoracic segments and not one on the first and three on the second, 

 third, and fourth as in that species. 



Fig. 11.- — Janirella loba- 

 ta. First pleopod op 

 male. a. As FOUND IN 

 ONE SPECIMEN. 6. As 

 FOUND IN TWO SPECI- 

 MENS. 



Family MUNNIDiE. 

 Genus MUNNA Kr0yer, 1839. 



MUNNA TRUNCATA, new species." 



Body oblong-ovate, about twice as long as wide. Surface smooth. 

 Color, in alcohol, whitish. 



a I have placed this species with Munna, although I am inclined to think that 

 it should be made the type of a new genus. If there is a consensus of opinion 

 in favor of this, I would suggest the name Gwcimunna for this form, and for 

 the species described from the Pacific coast of North America, which I called 

 Munna cwca, I would suggest the name Haplomunna. (See Bull. U. S. Nat. 

 Mus., No. 54, 1905, pp. 483^85.) 



