206 UNITED STATES NATIONAL MUSEUM BULLETIN 251 



Marianas Islands: Saipan ; Tanapag Harbor. P. E. Cloud, sta. D-8. One 

 specimen ( USNM 11473 ) . 



Description. — Examined were 33 deep-water forms and 5 shallow- 

 water forms from Japan and a single 18 mm. long specimen from Sai- 

 pan Island. Shallow-water forms from the Japanese waters are 20- 

 35 mm. in length, while deep-water forms are up to G5 mm. in length. 

 Appearance of test seems to vary remarkably according to locality; 

 soft, cartilaginous, yellowish white, and translucent in specimen from 

 Saipan Island, but leathery, yellowish brown, rather tough in some 

 shallow-water specimens from Japan, or extremely thin in deep-water 

 forms, except for posterior portion of body in some individuals, test 

 may be fairly thick in this portion. A bivalve shell, Musculus sp., was 

 embedded in test of shallow- water forms from Japanese waters. 



Calcareous spicules rather sparse in specimen from Saipan Island ; 

 9 branchial folds on each side, ninth on left, side vei*y low ; the 22 mm. 

 long individual from Kagoshima, Japan, has 8 folds on each side, 

 eighth not as tall as others on each side. Branchial sac often harbors 

 parasitic copepods (Saipan specimen) or amphipods (Japanese deep- 

 water forms). Alimentary canal located in posterior half of body in 

 deep-water forms. Gonad seems to mature in a relatively small-body 

 size in the tropics, is fully mature in specimen from Saipan. In deep- 

 water forms gonad is situated near posterior end of body. Ovary 

 occupies attacliment side of gonad and testis covers free surface. 



109. Herdmania monius var. grandis (Heller) 



Figure 92 



Cynthia grandis Heller, 1878, p. 97, pi. 5, fig. 26. 



Cynthia complamita Herdnian, 1882, p. 145, pi. 17, figs. 1-9. 



Microcosmufi Julinii von Drasche, 1884, p. 371, pi. 2, figs. 8-9; pi. 3, figs. 1-2, 



Microcosmus draschii Herdman, 1899, p. 20, pis. Cyn. 3-4. 



( For other references, see Kott, 1952, p. 279. ) 



MATERIAL EXAMINED 



Australia : Port Jackson. North Pacific Exploring Expedition, 1853-56, 

 William Stimpson, coll., sta. SH 142. Three specimens (USNM 11767). 



Description. — Three individuals collected at Port Jackson, Austra- 

 lia, were examined. Two are 85 mm., the other 160 mm. in length. 

 Test leathery, or leathery in appearance but rather soft and cartilagi- 

 nous; yellowish brown, strongly grooved on the surface, usually 1-2 

 mm. in thickness in the thinner dorsal portion, may reach 5-10 mm. 

 thickness at some thickened parts on the \entral side. Section and 

 inner surface of test whitish; mantle brownish, thick but rather soft. 

 Spicules typical ?/wwi?/.s-type. Branchial aperture subteriiiinal, atrial 

 slightly posterior to middle of dorsal side. Branchial folds 12 (left)- 

 13 (right) or 11( ?) (left)-14: (right) in two 85 mm. long specimens, 

 while 13 (left)-14 (right) in the 160 mm. long individual. Inner 



