PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 89 



some of the colonies shows a kind of granuhited appearance due to 

 many ag-gregations of spit'ules on the surface, on other colonies spicules 

 are not found so densely. The superficial spiculeless layer is defined on 

 some colonies. Spicules are of moderate size; most frequently about 

 40/* in diameter, varying from 20-3(V in some colonies to 30-58/x, in 

 others. They are usually of the vioseleyi-type, consisting of short, 

 stout, and bluntly tipped rays ; rays on the equatorial plane are 6 to 9 

 (about 8 on an average) to 10-14 (about V2 on an average). Some 

 colonies contain a small amount of spicules of the candidum-typQ con- 

 sisting of many small rays besides those of the moseleyl-typQ. In col- 

 lections from Balukbaluk Island and Boboh near Matanal Point of 

 Basilan Island, many small colonies are found in which the spicules of 

 the ca7ididu7n-type are dominant. 



Zooids very small, thorax 310/x and abdomen about 200/a in length. 

 Thoraces of zooids from larger colonies have the atrial aperture 

 opened widely, though those from small colonies have a well-defined 

 atrial siphon, for example in 4 mm. X 1 mm. and 3 mm. X 1.5 mm. 

 colonies from Large Sibago Island and small colonies from Baluk- 

 baluk Island. It is very possible that the cloaca in many zooids of 

 such small colonies must be extended to reach the common lacunae 

 which has not yet developed into a spacious and complicated one, and 

 thus the atrial siphon is formed. No atrial languet. Several longi- 

 tudinal muscles are on each side of the thorax. Retractile muscle 

 rather long, it may be up to twice as long as contracted thorax. Three 

 rows of stigmata and 6 or 7 stigmata in each row. Alimentary canal 

 curved as in many species of Didemnum. One testicular follicle, 

 proximal part of vas deferens coils 6 or 7 times. 



Trunk of larvae oval, GOO-680/a in length in specimens examined. 

 Ampullae 6 to 8 pairs. Two pigment flecks of sensory organ arranged 

 obliquely or dorsoventrally. 



Remarks. — No references are found concerning the structure of 

 zooids in Ilerdman's original description of the specimen from Ceylon. 

 However, the greenish unicellular algae embedded in the test, as well 

 as spicules of the moseleyl-type are common to both the Ceylon speci- 

 men and the present Philippine specimens. These may be regarded 

 as reasons for identifying the present specimens as LepfocUnum vlrlde. 



34. Leptoclinides reticulatus (Sluiter) 



Figures SOa-(j 

 Didemnum rcticulatum Sluiter, 1909, p. 60. 

 ? Didem,num ulhopunctalum Sluiter, 1909, p. 58, pi. G, fig. 8. 

 Leptoclinides sparsiis Michaelsen, 1924, p. 336, tig. 13. 

 Leptoclinides reticulatus Hastings, 1931, p. 92. 



MATERIAL EXAMINED 



Palau Islands : Barrier reef 8 mi. NW. of Koror Island ; GVF sta. 25. Six 

 colonies (USNM 11382).— Twayama Bay, Geruherugairu Pass; GVF sta. 85. 

 Three small colonies attached to Ilulimeda (USNM 11449). 



