10 BULLETIN : MUSEUM OF COMPAKATIVE ZOOLOGY. 



Alciope, annelid and crustacean larvae, Brachiurans, as well as Macru- 

 rans, and several species of Pteropods, the whole tow mixed in a broth 

 of pelagic alga;, in striliing contrast with the paucity of the pelagic fauna 

 and flora at tlie very surface. 



On another day, at 2.10 P.M., we made some hauls near the same 

 locality, olf Morro Castle, in seven hundred and forty-nine fathoms. Wc 

 towed at two hundred and fifty fathoms for twenty minutes. The open 

 part of the net contained many Sagitt^, Copepods, bells of Diphyes, 

 pelagic algte, Thysanopoda, Hyperiae, Limacina, and crustacean larvae. 

 There was neither animal nor vegetable life in the lower closed part of 

 the net. The water was smooth, a very light wind only having slightly 

 ruffled the surface. The surface tow-net contained many fragments 

 of Ctenophores, masses of Copepods, of Schizopods, of Macrurans and 

 Macruran larvte, as well as annelid larvte, Sagittee, Salpse, Doliolum, 

 Autolytus, Collozoum, and great numbers of pelagic algee. 



A second haul was made about an hour later at the same locality. We 

 towed for twenty minutes at a depth of one hundred and fifty fathoms. 

 This time the closed part of the net contained a few annelid larvae, 

 some Schizopods and Copepods, all of the same species we had found 

 on the surface. It also contained specimens of Limacina and Styliola. 

 None of these were in the surface tow-net, but they had been obtained 

 from the surface on another occasion. In the open part of the net, 

 which had remained open from one hundred and fifty fathoms to the 

 surface, we obtained the same Pteropods which were found in the closed 

 part of the net ; also the same Copepods and Schizopods, as well as the 

 same annelid larvae. In addition, the open part of the net contained 

 bells of Diphyes, fragments of Ctenophores, Salpae, Doliolum, crustacean 

 larvae, Collozoum colonies, and pelagic algae. 



On comparing the amount of material obtained in the closed part of 

 the bag from towing twenty minutes at a depth of one hundred and fifty 

 fathoms with the amount obtained at the surface in a tow-net dragged 

 during the same length of time, we cannot fail to be struck with the 

 poverty of the deeper haul as compared with the abundance of the haul 

 made at the surface. After hauling in about thirty fathoms of the wire, 

 we brought up a fine specimen of Pihizophysa. At six in the afternoon 

 we towed the Tanner net for twenty-five minutes in one hundred fath- 

 oms near the same locality. The wind had sprung up somewhat, so that 

 the surface tow-net contained practically nothing ; everything had been 

 driven froni the surface. In the closed part of the bag (towed at one 

 hundred fathoms) we found Doliolum, Copepods, Sagitta, and Schizo- 



