150 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



No deviations from the type usual in this genus were observed in 

 the digestive or reproductive organs. The latter were not developed 

 in most of the zooids examined, and none were found in which it 

 could be determined whether the testis is single or composed of two 

 glands, as is the case in many closely related forms. The vas deferens 

 makes several spiral turns about the testis. 



This species is sufficiently well represented in the collection to in- 

 dicate that it is common in the southern part of the Philippine region 

 if the writer is correct in including all the following specimens in 

 this species. 



No. 8. Station D5128 (off Nogas Island, Feb. 4, 1908, reef). One colony 



(Cat. No. 5S83, U.S.N.M.). 

 No. 100. Station D513I) (off Jolo Light, Feb. 14, 1908, 20 fathoms, coral 



sand). Many large colonies (Cat. No. 59S9, U.S.N.M.) 

 Nos. 11 and 12. Station D5145 (near Jolo Light, Feb. 15, 1908. 23 farhoms 



coral sand and shells). Three very small colonies (Cat. Nos. 



58S5 and 5888, U.S.N.M., respectively). 

 Nos. 9 and 13. Station D5136 (near Jolo Light, Feb. 14, 1908, 22 fathoms, 



sand and shells). Several small colonies (Cat. Nos. 5887 and 



5990, U.S.N.M., respectively). 

 No. 6. Station D5148 (off Sirun Island, Snlu Archipelago, Feb. 16, 1908, 17 



fathoms coral sand). Farts of one. or perhaps of several very 



large colonies (Cat. No. 5985 U.S.N.M.). 

 Station D5149 (off Sirun Island, Sulu Archipelago, Feb. 18, 1908, 10 



fathoms, coral and shells). Small colonies. 

 No. 13. Station D5150 (off Sirun Island, Sulu Archipelago, Feb. 18, 1908, 



21 fathoms, coral sand and shells). One colony (Cat. No. 5884, 



U.S.N.M.). 

 No. 10. Station D5154 (near Bakun Point, Tawi Tawi Group, Sulu Archi- 

 pelago, Feb. 19, 1908, 12 fathoms, coral sand). Two colonies 



(Cat. No. 5886 (U.S.N.M.). 



Herdman's type was a large colony obtained by the Challenger 

 expedition off Zebu, Philippines, in 95 fathoms. The writer has 

 made it clear in a previous article (1910, p. 374) that the present 

 form has nothing to do with Leptoclhium albidum Verrill, 1871. 

 It seems best therefore to give the form the rank of a species, though 

 it must be admitted that it is very close to Savigny's original type of 

 the genus, Didemnum candidum (Savigny, 1816, pp. 14 and 194. 

 pi. 4, fig. 3; pi. 20, fig. 1) from the Gulf of Suez, and it seems not 

 unlikely that this and a number of other species of this genus from 

 tropical and subtropical seas will eventually have to be united with 

 Savigny's species. 



There are two other colonies in the Albatross collection both of a 

 chalky white color and densely crowded with spicules ; that the writer 

 also refers to this species, though the spicules lack the regularity 

 in the form of the points or rays which is so characteristic of the 

 specimens just described. The rays are numerous, sometimes sharp, 

 sometimes irregularly blunted; the spicules resembling, in fact, those 



