NEMERTEANS 1 69 



the intestine. The distance from the tip of the snout to the anterior 

 sexual pouches is therefore very short. 



Habitat. Among ascidians and other growths on piles of wharf 

 in San Pedro Harbor, Calif. ; fairly common. Sexually mature in 

 August. Ova large, opaque ; pale greenish in color. 



This new species resembles both T. vittatum (Hubrecht) Burger 1 

 and T. quadristriatum Langerhans 1 in general appearance, and in 

 having four longitudinal brown lines on dorsal surface. In the former 

 species, however, the four lines usually become confluent behind the 

 head in two quadrangular patches which send two fine lines between 

 the posterior pair of ocelli ; in the latter species the two median lines 

 extend to the tip of the head before uniting, while the lateral are inter- 

 rupted between the ocelli and do not unite on tip of head. In T. 

 quadrilineatum, as described above, the median lines reach nearly to 

 tip of snout, but do not join each other, while the lateral lines usually 

 end behind the ocelli. 



13. TETRASTEMMA (CERSTEDIA) DORSALE (Abildgaard) 



Mclntosh 



Planaria dorsalis ABILDGAARD, Zool. Danic., iv, p. 25, 1806. 



Tetrastemma dorsalis MclNTOSH, British Annelids, pt. I, Nemerteans, Ray 



Soc., p. 172, 1873. 

 Oerstedia dorsalis Burger, Fauna und Flora des Golfes von Neapel, Monogr. 



22, p. 592, 1895. 



This small, widely distributed species was collected by Mr. J. F. 

 Abbott in about 20 fms. in Monterey Bay, Calif. 



The species may be recognized by its firm, slender, cylindrical 

 body, usually only 8-15 mm. in length, somewhat narrower toward 

 both extremities ; flesh color or pale yellowish, mottled on dorsal sur- 

 face with brownish blotches and dots of .various shades and with con- 

 siderable variation in distribution, often being mainly collected into a 

 series of transverse bands with a few scattered blotches between. 



1 Hubrecht, A. A. W., Genera of European Nemerteans critically revised. 

 Notes from Leyden Museum, p. 229, 1879. 



Hubrecht placed this species in the genus CErstedia, but Burger refers it to 

 Tetrastemma. The specific name vittatum is preoccupied in Tetrastemma, how- 

 ever, by Verrill, who described and figured a widely different species under this 

 name in 1874 (American Journal of Science, vn, p. 45). If Hubrecht's species 

 actually belongs to Tetrastemma, it is obvious that it must receive a new specific 

 name. 



2 Langerhans, P., Die Wurmfauna von Madeira, Zeits. f. wiss. Zool., xxxiv, 

 p. 136-140, iSSo. 



