364 



SCIENCE. 



[N. S. Vol. XVIII. No. 455. 



Among the medusae, nineteen genera of 

 craspedotes and one genus of acraspedotes 

 have been taken, each represented by one 

 species. Of these species, only four 

 {Aurelia lahiata, Phwlidium gregarmm, 

 Prohoscidactyla flavicirrata, Thaumantias 

 cellularia) have been reported previously 

 from this coast; three {Cladonema radia- 

 tum, Tiara pileata, Tiaropsis diademata) 

 are known in the eastern United States or 

 in Europe ; of the remaining thirteen, seven 

 are in all probability new to science. 



Six species of Siphonophora, represent- 

 ing as many genera, have been collected. 

 Two are old species, world-wide in their 

 distribution {Sphceronectes kollikeri, Di- 

 phyes appendiculata) . The others have 

 not been closely identified, owing largely 

 to their fragmentary condition; two are 

 physoneets, two cystoneets. 



Four species of Ctenophora, each repre- 

 senting a genus, have been collected. Two 

 of these are well known north of San 

 Francisco {Pleurobrachia iachii, Beroe 

 cyathina\. The third {Mertensia sp.) 

 closely resembles the M. ovata of the east- 

 ern coast. The fourth is a lobate, which 

 has appeared only in immature stages and 

 can not be placed accurately until the adult 

 form is known. 



These floating forms were obtained by 

 the tow-net at the surface and in vertical 

 hauls from depths varying from thirty to 

 one hundred and sixty fathoms. Some of 

 the species were taken in almost every haul 

 at whatever depth {Diphyes appendicu- 

 lata, Sphceronectes kollikeri, Glossocodon 

 sp., Obelia sp., Mertensia sp.). Most of 

 them are represented by less than six in- 

 dividuals, some by but a single specimen. 



On the shores of San Diego Bay, Point 

 Loma, Coronado and the Coronado Islands, 

 and in hauls of the dredge at depths vary- 

 ing from three to fifty fathoms, off Point 

 Loma and in the mouth of the bay, there 



were obtained thirty species of liydroids 

 representing fifteen genera, nine species of 

 anemones representing six genera, two spe- 

 cies of madrepore corals and five species of 

 alcyonarian corals. 



Of the thirty species of hydroid.s, at least 

 four are new to science, eleven others have 

 not been foimd here before, and two are 

 new to the Pacific Coast. If to these thirtj' 

 species there be added the fourteen pre- 

 viously reported but not obtained this 

 season, the resulting total of forty-four will 

 siirpass the total known for any other re- 

 gion south of Puget Sound, and embraces 

 representatives of nine of the eleven fam- 

 ilies known on the coast. 



Of the nine anemones, all save one {Sa- 

 gartia sp.) are found at San Pedro, two 

 reaching beyond that point to the north, 

 one to Puget Sound (Epiactis prolifera), 

 the other to Santa Barbara {Anthopleiira 

 calif ornica). All are peculiar to this coast. 



None of the six corals are new species, 

 but, so far as can be judged at present, are 

 peculiar to the Pacific Coast. 



Mr. Esterly summarizes the results of 

 his study of the pelagic copepods as fol- 

 lows: 



Twenty-seven species were recognized, of 

 which twenty-two were accurately deter- 

 mined. These belonged to the following 

 genera: Acartia, Calanus, Euchirella, He- 

 terochdta, Metridia, Oitlwna and Sap- 

 phirina. Five of the twenty-seven species 

 have not been reported previously outside 

 the Mediterranean Sea. Four are new to • 

 North America. 



The list of species obtained by the Alba- 

 tross dredging on the west coast of South 

 America and Mexico, and in the Gulf of 

 California in 1891, contains forty-eight 

 names. This number can now be increased 

 by fourteen determined species, at least on 

 the west coast of the Americas. Five of 

 the species identified are common to this 

 and the Woods IToll region on the Atlantic 



