ASCIDIANS OF THE PHILIPPINES VAN NAME. 81 



Branchial sac with seven folds on each side, the last fold much 

 lower than any of the others. Transverse vessels numerous, mostly 

 of two sizes -placed alternately; additional slender vessels crossing 

 the stigmata also occur in some places. Internal longitudinal vessels 

 narrow but rather numerous, generally separated on the intervals 

 between folds by five or six stigmata. Their distribution is about 

 as follows : 



dorsal 1 (16) 2 (IS) 2 (21) 3 (20) 3 (18) 3 (13) 3 (9) 1 ventral. 



Digestive tract forming a rather long narrow loop. Stomach 

 elongate, bearing on its dorsal aspect an extremely large mass (or 

 several closely adjacent masses) of rather long slender branching 

 hepatic tubules. Rectum short; margin of anus with a number of 

 rounded lobes. 



Two gonads on each side; on the left side a large one consisting 

 of small irregularly shaped sacs arranged along each side of a com- 

 mon oviduct lying within the intestinal loop, and a small one dorsal 

 to the loop consisting of a single row of a few sacs along only one 

 side of a short common oviduct. On the right side the two gonads 

 are more nearly of the same size. 



Both of the two specimens were taken at Catabalogan, Samar. 



Type.— Cat. No. 6038, U.S.N.M. 



Genus MICRO COSMUS Heller, 1877. 



MICROCOSMUS EXASPERATUS Heller, 1878. 



Plate 32, fig. 39. 



1878. Microcosmus exasperatus + M. variegatus + M. distans +? M. affinis 



Heller, Sitzungsber. Akad. Wiss. Wien, Math.-nat. class., vol. 77, 



pp. 9S-100, pi. 1, fig. 6 ; pi. 3, figs. 19-20 ; pi. 5, fig. 27. 

 1882. Microcosmus variegatus Tkaustedt, Vidensk. Meddel. Nat. For. Kjo- 



benhavn, ann. 18S2, p. 47, pi. 5, figs. 10-11 ; pi. 6, fig. 17. 

 ?1883. Microcosmus claudicans Tkaustedt, Mitth. Zool. Stat. Neapel, vol. 4, 



p. 476, pi. 36, fig. 11 ; pi. 37, fig. 7. 

 1885. Microcosmus variegatus Tkaustedt, Vidensk. Meddel. Nat. For. Kjo- 



benhavn, ann. 1884, p. 42. 

 1891. Microcosmus exasperatus +M. variegatus +M. distans Herdman, 



Journ. Linn. Soc. London, Zool., vol. 23, pp. 514-515. 

 1900. Microcosmus miniatus Verrill, Trans. Connecticut Acad. Sci., vol. 10, 



p. 590. 

 1902. Microcosmus miniatus Van Name, Trans. Connecticut Acad. Sci., vol. 



11, p. 396, pi. 56, fig. 79; pi. 57, figs. 91-95; pi. 62, figs. 129-130; 



pi. 64, fig. 148. 



1908. Microcosmus exasperatus, subspecies typicus Michaelsen, Mitth. 



Naturhist. Mus. Hamburg, No. 25, pp. 271-278, pi. 2, fig. 11. 



1909. Microcosmus exasperatus, subspecies typicus Hartmeyer, Bronn'a 



Tier-reich, vol. 3, suppl. p. 1345. 

 1912. Microcosmus exasperatus Hartmeyer, Denkschr. Acad. Wiss. Wien, 

 Math.-Nat. Class., vol. 88, pp. 8-9. 



101825°— Bull. 100—17 6 



