———— 
Vou. 2] Ritter—The Pelagic Twnicata. 89 
zooids have been taken together in great numbers off San Diego, 
particularly in May and June. The following table shows the 
number of each generation in lots taken at random from collec- 
tions made in May, June, and July, 1904. 
Phorzooid. Gonozooid. Phorzooid. Gonozooid. 
Dge lav eth eh, s opens (o) ohs <irs auaps 35 (Sd PCR CECI ROEEEESS CORE 40 
Mpreh cao erste, ae ate! stoys 35 AR frat a ayer Oansrsye docgahkona) ane 31 
Se ea iar gAaSH Sy ache tol sl 1 is 42 Si vavekstetanncmarohensy avisteis ois 37 
CHa Popecase’s te cea S siehie 33 MOM weiaie/auo a tais st Ste Slee a 90 
DET atone erdete 3 Oo Md Masher cl taaustiers sie hep asebaneay 35 
Gi A acbadecks tls hs Ste uiebavs 30 1 WY re areets cicr ee ee 83 
Oe aispsontseauec ro tenciis snakes 38 
In view of the constant great preponderance in individuals 
of the sexual generation here, and the entire absence of any other 
than the sexual generation in the vast quantities of specimens 
taken by the ‘‘Triton’’ in the north Atlantic, it would seem 
that this generation is normally more abundant in individuals 
than is the phorozooid generation. Borgert, 1894, reports both 
generations from the Plankton Expedition, but gives no informa- 
tion as to the relative numbers of each. 
Fig. 26.—D. tritonis, Trophozooid. 
(d) Trophozooid.—Fig. 26. General form, the peduncle dis- 
regarded, that of a truncated cone with an oblique base; intest- 
inal tract extending prominently behind the level of the endo- 
style. A maximum, so far as known, of 25 pairs of branchial 
stigmata. Pedunecle very broad at distal end and narrowing 
toward the body of the zooid; length of largest specimens seen, 
