200 University of California Publications. [zoology. 



The specimens of this larva did not seem to endure confine- 

 ment as well as did those of T. ritteri . 



No specimens wei*e taken in the surface towiugs. All 

 obtained were in nets that had been down to a depth of forty 

 to seventy-five fathoms. 



3. Absence of the tornaria stiujc in 1lie development of 

 Dolichoglossus pusillus Ritter (MS.). 



The adult of this species is very abundant at several places 

 mi the southern coast of California, particularly at San Diego 

 and in the inner harbor at San Pedro. 



It is described by Ritter in MS. soon to be published, and a 

 brief account of some of its habits has been given by him, 

 Ritter, '02. 



The following notes were taken from time to time during a 

 period extending over six years. Observations were made at 

 San Pedro where the animals have been very abundant, until 

 recently, near the entrance to the harbor. The area of greatest 

 numbers has gradually shifted toward the mouth of the harbor. 

 None were found in 1902 in places where they were abundant in 

 1897. In 1900 there were two areas of distribution, one at low 

 tide mark, where large individuals predominated; the other con- 

 siderably above low tide mark, where small ones predominated. 



The sexes differ slightly in color, the male being pale orange 

 and the female somewhat brighter. At the time of the last 

 observations, November, 1902, the males greatly exceeded the 

 females in number. Sperm is discharged in a delicate milky 

 stream through the pores of the ripe genital lobes. This 

 observation was confirmed by detaching some of the Lobes and 

 watching the discharge under the microscope. The spermatozoan 

 is small and has a spherical head. 



Ova are discharged through the genital pores as observed by 

 Morgan and others, and not through rupture of the body wall 

 as stated by Bateson, '84, for B. iowalevskii. The eggs are 

 almost perfect spheres. Their color and that of the young 

 embryos is a light tint of yellow ochre. 



Specimens containing ripe sexual elements were collected 

 early in August and as late as December. The breeding season. 



