PACIFIC TUNICATA OF U.S. NATIONAL MUSEUM 



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Figure 22. — a, b, Didemnum (Didemnum) sphaericum, new species: a, spicules, X 940; 

 b, testicular follicle, c, d, Didemnum {^.Didemnum) macros piculatum, new species: 

 Cy spicule, X 425; d, strongly contracted thorax, posterior side. 



iired together with mature testis; one testicular follicle, the distal 

 portion of which is remarkably narrowed to give the organ a bulblike 

 shape; proximal portion of vas deferens coils about six times. 



Remarks. — The soft consistency of the test and the bulb-shaped 

 testicular follicle are the best characteristics of the present form, dif- 

 ferentiating it from any known species. In Didemnum {Didemnum,) 

 dorotubu the testicular follicles are also sometimes bulb-shaped, but 

 the appearance of the test differs considerably from that of the present 

 new species. 



23. Didemnum (_? Didemnum) macrospiculatum, new speciea 



Figures 22c, d 



HoLOTYPE.— USNM 11489; Gilbert Islands: Onotoa Atoll, about 

 13,400 feet S. 75° W. from Aiaka Maneaba, in the deep central part of 

 the lagoon; living and dead coral patches on limesand and limemud 

 bottom. Preston E. Cloud, sta. GOC-55, August 25, 1951. 



Paratype.— USNM 11808 : same data. 



Description. — Two colonies are in the material, respectively, 30 mm. 

 X 10 mm. and 12 nun. X 7 mm. in extent and about 1 mm. in thickness. 



