NEMERTEANS 1 73 



Alimentary Canal. A pair of rather large diverticula of the in- 

 testinal caecum reach forward to the brain, and pass to the dorsal side 

 of the dorsal ganglia. They join the broad unpaired caecum shortly 

 behind the mouth. The caecum extends backward beneath the esopha- 

 gus, sending off a few broad diverticula. The narrow posterior por- 

 tion of the esophagus does not join the intestine until after the appear- 

 ance of several pairs of sexual glands. In this, and a number of 

 other features, the species very closely resembles T. quadrilineatum. 



Nephridia. The nephridial system is limited to the region near 

 the brain. Its tubules extend beside, as well as a very short distance 

 behind, the brain. The single pair of efferent ducts open laterally 

 just opposite, or a trifle behind, the posterior ends of the dorsal 

 ganglia. 



Cerebral Sense Organs are remarkably large. They are situated 

 beside and beneath the ventral ganglia, and project somewhat in front 

 of them. Large ducts pass antero-ventrally to the surface of the head, 

 as usual. 



Nervous System. The brain is unusually voluminous ; otherwise 

 the nervous system agrees with that of related species. 



Reproductive Organs. Sexual products are mature in September. 

 The ova are very large (about .18 mm. in diameter), pale olive green 

 in color, arranged in a single row along each side of intestinal region. 

 The spermatic pouches are correspondingly voluminous in the males. 

 As stated above, the anterior sexual glands extend well in front of the 

 posterior end of the esophagus (pylorus), so that but a comparatively 

 short distance intervenes between them and the brain. 



Habitat. On piles of wharf in San Pedro Harbor, Calif., common. 



15. T^NIOSOMA PUNNETTI 1 sp. nov. 

 pi. xvi, figs. 1-3 ; pi. xvui, fig. 6. 



Body large, soft, flabby, extremely contractile, rounded in esopha- 

 geal region, and much flattened posteriorly when extended ; much like 

 T. princeps* in shape, and, like that species, becoming very short and 

 subcylindrical when strongly contracted. 



Head and anterior portions of body extremely contractile ; smooth 

 and somewhat flattened when moderately extended, but abruptly trun- 

 cated, cylindrical, and thrown into deep circular wrinkles when con- 



!The species is named in honor of Mr. R. C. Punnett, of St. Andrews, Scot- 

 land, well known for his recent work on this group of worms. 



2 Coe, Proc. Wash. Acad. Sci., in, pi. n figs. 3, 4, p. 62, 1901 ; also preceding 

 article, paged identically. 



" 



