94 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



mandible is irregularly spatulate and broadened at the tip; the edge of 

 the rostrum often becomes irregularly spinulose. Also from the base of 

 the avicularian chamber lateral furcate spinose processes are developed. 

 The erect chamber or pedicel may be free or it may be fused with the 

 ectooecium. Its nature is very similar to that described by Busk (1884: 

 78) and Waters (1888:12) for C. (Electa) cylindracea. 



The ovicell is typical of Chapperia, rounded, prominent, cucullate, 

 smooth, but the ectooecium is more complete than in most other species ; 

 it measures about 0.26 mm in width. 



By the similarity of the avicularia this species appears to be most 

 nearly related to C. cylindracea (Busk) from the Indian Ocean, but it 

 differs in the nature of the spines which are much longer and entirely 

 unmodified ; in the absence of a widely flaring mural rim, and in the nar- 

 rower cryptocyst, as well as in the form of the avicularian mandible. 



Type, AHF no. 24. 



Type locality, Hancock Sta. 1385-41, 13 miles SSE of East Point, 

 Santa Rosa Island, southern California, 75 fms. Two colonies, one en- 

 crusting a hydroid stem and the other on a shell fragment. 



/^ ? Chapperia varians (O'Donoghue), 1923 



'7'- ; 



Membranip or a varians O'Donoghue, 1923:29. 

 Chaperia varians (O'Donoghue), 1926:40. 



The generic relationship of this species is in doubt, due to the lack 

 of important characters in the description. Ovicells were not found and 

 there is no mention of the nature of the communication pores nor of the 

 method of attachment of the opercular muscles. O'Donoghue transferred 

 it from Membranipora (where it cannot belong) to Chapperia at Waters' 

 suggestion, but it might as well be a Callopora or Hincksina. Whatever 

 it is, it appears to be a good species, and I append a brief list of the 

 characters in the hope that some one may later recognize it and have 

 sufficient material to complete the description. 



A smooth thin cryptocyst occupies about one-third of the frontal area ; 

 the opesia is oval with a thin, low rim and occupies nearly all of the 

 remaining front; a few small lateral and distal spines are present; a 

 proximal avicularium is borne on a short truncated conical base in the 

 midline (suggesting Chapperia) and a minute stalked avicularium is 

 situated on either side opposite the operculum. Off Protection Gap and 

 off Snake Island, British Columbia (O'Donoghue). 



