NO. 1 DICKINSON : SPONGES OF GULF OF CALIFORNIA 29 



are spined centrotylotes, bent at the central knob. The third microsclere 

 is a smooth, straight centrotylote about 2 /x by 21 jx. The spiny centro- 

 tylotes are intermediate in size between the first and third type. 



Holotype. — AHF no. 14. 



Type locality. — San Lorenzo Channel, Espiritu Santo Island; 48 m; 

 bottom of coralline. 



Distribution. — Same. 



Alaterial exa?nined. — 

 Sta. 607-36 Espiritu Santo Island 3-21-36 48 m 



Remarks. — H. papillosa Thiele, 1905, is a close relative of this sponge. 

 It was reported on the Presidential Cruise of 1939 by de Laubenfels, 

 1939, from Albemarle Island, Galapagos, and it was originally described 

 from Chile. It, however, does not have the centrotylotes either smooth or 

 spiny and has instead sharply bent spiny tornotes. 



Family HalichondHidae Gray 



Genus HALIGHONDRIA Fleming 



Halichondria panicea (Pallas) 



Plate 51, Fig. 102; Plate 52, Fig. 103 



Spongia panicea Pallas 1766, p. 388. 

 Halichondria panicea Johnston, 1842, p. 114. 



Diagnosis. — This is an encrusting sponge, white in alcohol, orange in 

 life, with a smooth surface. The ectosomal specialization is strongly 

 marked. There is a dermal layer 150 /i, to 200 ^ thick containing tan- 

 gentially placed spicules. The endosome has the same spicules in confusion. 

 These spicules are oxeas 12 /x, by 245 /* to 15 /x by 250 /x. 



Holotype. — Unknown. 



Type locality. — Europe. 



Distribution. — Cosmopolitan. 



Material examined. — 

 Sta. 519-36 San Francisco Island 2-26-36 Shore 



Sta. 549-36 Angel de la Guardia Island 3- 6-36 80 m 



Remarks. — This sponge is common in European waters and is found 

 along the California coast as well as in the Galapagos Islands. 



Family Semisuberitidae de Laubenfels 



Genus RHAPHOXYA Kallmann 



Rhaphoxya laubenfelsi, new species 

 Plate 52, Fig. 104 



Diagnosis. — The color of this sponge in alcohol is light green through- 

 out. The general shape is ramose, much like tree coral, with an over-all 



