i8o Natural History Bulletin. 



or more, and are grea'ly expanded, the front edge of eaclj 

 extending forward and upward over the one in front, Each 

 leaflet has a row of nematophores along its free margin, a 

 strong double process at its base, and a series of distinct nar- 

 row ridges leading from these nematophores directly toward 

 the base of each leaflet, giving a remarkably beautiful radiat- 

 ing style of ornamentation, making this the most ornate cor- 

 bula in the collection. 



Two species of unusual size represent the genus Chidocar- 

 pus. The flrst, C. -paradisea Allman. is well named. It is 

 hard to keep from using extravagant language when describ- 

 ing these surpassingly graceful and striking forms. The other 

 species was described by Allman under the name Ao-Jaophcuia 

 sigin I from specimens destitute of the gonosome. Our series 

 shows the gonosome, and demonstrates the fact that it belongs 

 to Cladocarpiis, having the typical gonosome of that genus. 

 Both of these species attain a height of about two feet. 



One of the prizes encountered among the hydroids is a 

 species of Idia dredged from shallow water near Key West. 

 Only one species has hitherto been known wdiich was so 

 unique that it was made the type of a new family by Allman. 

 The original form was found near the Philippine Islands and 

 off Bahia. The characteristic urn-shaped gonangia were well 

 shown in our specimens. They are among the most beautiful 

 of all the various structures developed for the protection of 

 the reproductive zooids among the hydroids. 



No attempt has as yet been made to study the deep-water 

 sponges of the collection, nor can the general zoologist hope 

 to do anything with tliis difficult group.. Judging from the 

 tioTires in Professor Alexander Agassiz' "Three Cruises of 

 the 'Blake.'" it appears that we secured among others the fol- 

 lowing species of silicious sponges belonging to the Hexac- 

 TiNELLiD.^: Fdrreu faniiidj. a species formed of anastomos- 

 ing cylinders of the most delicate lace-work; Aphrocallistcs 

 hocao-ci, with an equally beautiful network of silicious spicules 

 forming series of prominences like linger tips; T/s/pIioiiid 

 fcncstrala, which usually assumes a more or less globular 



