52 University of California Publications in Zoology. [Vol.8 



Seising jaws (pi. 4, fig. 35) 8 to 11, similar in form and structure to 

 Krumbach 's (1903) description. Jaws with oval cross-section, the pulp 

 very scantily filling center of canal. In some instances the pulp is 

 swollen near the base of the point. Base of point and top of shaft con- 

 verge upon approaching edge of jaw. Points sickle-shaped, the amount 

 of curvature varying among the individuals and also among the different 

 jaws of the same specimen. Pulp-canal approximately central. Unlike 

 Krumbach (1903), I have been unable to detect any evidence of sag- 

 iuation. 



TABLE 14 

 Measurements of Eulrohnia hamata^ 



Lateral fin t- ■£ ?> 



1 All measurements made in per cent of total length of animal. 



2 Per cent of lateral fin in front of tail-septum. 



In most of the specimens the ovaries were well developed and the 

 eggs well toward maturity, but for some unknown reason the upper third 

 of the ovaries had burst and the eggs were scattered throughout the 

 body-cavity. This made it impossible to determine the length of the 

 ovary except in a very few instances. 



Eulirohnia hamata is very readily distinguished from both 

 the -other species of the genus. To the naked eye it bears con- 

 siderable resemblance to Sagitfa serratododata. In fact the 

 resemblance is so striking that it is difficult to distinguish the 

 two with the naked eye. The microscope, however, readily 

 reveals the difference. 



Eukrohnia subtilis (Grassi) 



PI. 2, fig. 9; pi. 3, fig. 25; pi. 4, fig. 36. 



Spadella subtilis Grassi (1883). p. 23. 



Erolmia subtilis, Strodtmann (1892), p. 22; Fowler (1905), p. 78, 

 (1906), p. 25. 



Characters 



Body, unlike E. Jiamata. nearly transparent (pi. 2, fig. 9). Extremely 



