246 



TJuivvrsitu of CaVtfornia Fuhlirations in Zoology [Vol. 18 



strictest sense of the word, a female, while the salpa it produces by 

 budding is a male. Virtually, the mother salpa gives rise by budding 

 to her sons, and each son serves first as a depository for one of his 

 mother's mature but unfertilized eggs, then as a living incubator 

 within which his mother's daughter is housed and reared, and lastly 

 as a father. Such, in brief, is the curious sexual situation relative 

 to the life cycle of the salpae. 



2. Crude Data and Method of Procedure 



All hydrographic data corresponding to hauls herein considered, 

 as well as description of the method of collecting, have been published 

 elsewhere (Michael, 1911; Michael and McEwen, 1915). Accordingly, 

 only those data directly concerned in the present inquiry are pre- 

 sented in table 1. But enough are included to permit anyone to check 

 the computations. For meaning of the term, section, see page 266. 



Table 1 

 Data relative to June and Julv surface hauls of the years 1908 and 1909 



In specifying the two-hour period it is assumed that the whole haul was made within the 

 limits given ; actually it has, in many instances, overlapped on the preceding or succeeding 

 period. In such cases the period in which the greater amount of time was consumed is 

 entered in this table. 



