200 EXPEDITION OF THE "ALBATROSS," 1899-1900. 



temp. 66°. Four specimens of the aggregate generation were collected on 

 the surface at night. 



Three are about 1 cen. in length and have rather narrow muscle bands. 

 One of these has the posterior extremity prolonged into a prominent process 

 about 1 mm. in length. The fourth specimen is 2 cen. long and has much 

 broader mu.scle hands than the other three. 



Stn. 12 A.A., Sept. 4, 1899, Lat. N. 12° 07', Long. W. 137° 18', surface 

 temp. 81°. One specimen of the aggregate generation was collected. It is 

 1.5 cen. in length, witli a process at the posterior end measuring 5 mm. 



Stn. 15 A. A., Sept. 8, 1899, Lat. N. 4° 35', Long. W. 136° 54', surface 

 temp. 79°. One specimen of the solitary generation was taken at 8 p. m. 



Stn. 31 A. A., Sept. 19, 1899, Lat. S. 12° 20', Long. W. 144° 15', surface 

 temp. 80°. 



One specimen of the solitary generation and four of the others have a 

 short bifid process. 



Salpa hexagona (Hov et Gaim. 



This species was collected at three stations in the tropical Pacific. 



Stn. 8 A.A., Sept. 2, 1899, Lat. N. 17° 13', Long. W. 136^ 09'. A single 

 yoiuig specimen of the solitary generation was taken in the trawl, which liad 

 been down to a depth of 3088 fathoms. It measures 11 cen. in length, ex- 

 clusive of the two posterior processes which are 1 cen. long, and is 3 cen. in 

 breadth. This makes it almost exactly twice the size given by Traustedt in 

 his description of the species. The processes, however, in Traustedt's figures 

 are about | the length of the bod}- and are serrate. In this specimen the 

 proces.ses are only -^^ of the length of the body and are smooth. In all 

 other respects the specimen agrees perfectly with Traustedt's figures. 



Stn. 12 A.A., Sept. 4, 1899, Lat. N. 10' 57', Long. W. 137° 35', surface 

 temp. 81°. Fifteen specimens of solitary generation were collected. 



They are all young with a large part of the eleoblast still present. Their 

 average length is 3 cen. and the ^jrocesses at the posterior end are \ of the 

 length of tlie hod}'. 



