PELAGIC LIFE, FALMOUTH. 49 



Amphioxus lanceolatus was secured in seventeen fathoms of 

 water. This single specimen measured 3-m.m. in length and 

 was furnished with fourteen gill-slits. In the same gathering a 

 very singular veliger larva of a gasteropod mollusk was detected. 

 The velum was divided into four distinct ciliated lobes, and near 

 the extremities of each were patches of red pigment, which may- 

 have served for visual purposes. In addition to these pigmented 

 patches, the eyes were well defined at the base of each of the 

 tentacles. A larva of a gasteropod mollusk almost identically 

 like mine is figured by Professors Korschelt and Heider.(^) This 

 illustration is copied from a paper by Mr. J. P. McMurrich,(^) 

 which, however, I have not had the opportunity of consulting. 

 Unfortunately, this is the only specimen of this larva I have 

 been able to secure. During this time the larva of an interesting 

 species of Terebellidse, inhabiting a transparent tube, was 

 observed very frequently in surface-net collections. 



September. This month was exceptionally fine, but the 

 pressure of other work prevented my devoting much time to the 

 study of marine life, and so my remaining observations are 

 very fragmentary. On the morning of the lith, the surface 

 temperature of the sea was 60-3 F, and on the 27th, it was 

 59 '9 F. During this month the pluteus stage of various species 

 of Echinoderms proved abundant. Copepods and other forms 

 appeared to be more plentiful than in previous years in surface- 

 net gathering, this perhaps being due to the high temperature 

 of the sea during the month. Muggioea atlantica continued to 

 be fairly abundant till the end of the month. 



October. On the 2nd, at 6-30 a.m., the surface temperature 

 of the sea had fallen to 57-9 F. In the surface-net gathering 

 made at that hour, a great increase was noticed in the specimens 

 of Corycseus anglieus, the females in numerous instances 

 having ova attached. On the 4th, a few examples of the 

 infusorian Perdinium tabulatum were observed in the surface- 

 net gathering made on that morning. On the 10th, the surface 

 temperature of the sea was 58-9 F. In the surface-net, 

 specimens of Sagitta were very numerous. The last surface-net 

 gathering for the year was made on the 23rd. In this gathering 

 Corycseus anglieus, Muggioea atlantica, Sagitta, Cyphonantes, 



