126 BULLETIN" 100, UNITED STATES NATIONAL MUSEUM. 



Esophagus short and curved, stomach small and inconspicuous, of 

 short oval form, and situated beside, or extending a trifle posterior 

 to, the posterior end of the branchial sac. From the stomach the in- 

 testine bends forward and extends straight forward toward the an- 

 terior end of the body, ending at about one-third the body length 

 from the anterior end in an orifice 'whose border has many small 

 lobes. 



Ovary elongate, tapering gradually into the stout oviduct. Os r ary 

 and oviduct lie along the dorsal side of the intestine, the oviduct ex- 

 tending farther toward the anterior end of the body than the intes- 

 tine. 



The male organs consist of many small glands connected by 

 branching ducts which ramify over the surface of the stomach and 

 posterior part of the intestine. They discharge by a common duct 

 which lies along the ovary and oviduct (for the most part upon that 

 side of the latter which is toward the branchial sac) and which ex- 

 tends still nearer the anterior end of the body than the oviduct. 



Represented in the collection by three specimens, all rather large, 

 from two localities, which are as follows : 



No. 103. Station D5432 (off Corandagos Island, Apr. S, 1909, 51 fathoms, 

 sand). One specimen. (Cat. No. 59S0, U.S.N.M.) 



No. 152. Station D5153 (off Tocanhi Point, Sulu Archipelago. Feb. 19. 1908, 

 49 fathoms, coral sand and shells). Two specimens. (Large 

 one is type, Cat. No. G039, U.S.N.M.) 



Family DIAZONIDAE Garstang, 1891. 

 Genus RHOPALOPSIS Herdman, 1890. 



RHOPALOPSIS CRASSA (Herdman), 1880. 

 Plate 2S, fig. 14. 



1SS0. Ecteinascidia crassa Herdman, Proc. Roy. Soc. Edinburgh, vol. 10, 



p. 723. 

 18S2. Ecteinascidia crassa Herdman, Rep. "Voy. Challenger, vol. 6, Tunicata, 



p. 241, pi. 36, figs. 12-14. 

 1S90. Rhopalopsis crassa Herdman, Proc. Liverpool Biol. Soc, vol. 5, p. 1G0. 

 1891. Rhopalopsis crassa Herdman, .Tourn. Linn. Soc. London, Zool., vol. 



23, p. 601. 

 1S9S. Rhopalopsis crassa Herdman, Ann. Mag. Nat. Hist., ser. 7, vol. 1, 



p. 447. 

 1899. Rhopalopsis crassa Herdman, Cat. Australian Mus. Sydney, No. 17, 



pp. 8 and 112. 

 1904. Rhopalopsis crassa Sluiter, /Sibo#a-Expedition, vol. 56a, p. 126. 

 1909. Rhopalopsis crassa Hartmeyer, Bronn's Tier-reich, vol. 3, suppl., 



p. 141S. 



As explained below, the writer feels little doubt that Rhopalopsis 

 fusca Herdman (1880) is identical with the above species. As it was 



