NO. 1 DICKINSON : SPONGES OF GULF OF CALIFORNIA 45 



It has oxeas and ana- and protriaenes several mm long. One protriaene 

 was found which measured 32.4 mm long. The most characteristic spicule 

 is the spiny sigmalike microsclere, which has well-rounded, almost tylote 

 ends. They are thicker in proportion to their length than true sigmas and 

 are about 10 ^a long. 



Holotype. — U.S.N.M. 



Type locality. — Pescadero Point, California. 



Distribution. — Central California to the Gulf of California. 



Material examined. — 



Remarks. — This is the most common sponge in the Hancock collection 

 from the Gulf of California. 



Order GaRNOSA Carter 



Family Halinidae de Laubenfels 



Genus PACHASTRELLA Schmidt 



Pachastrella dilifera de Laubenfels 



Plate 87, Fig. 174; Plate 88, Fig. 175 



Pachastrella dilifera de Laubenfels, 1934, p. 1. 



Diagnosis. — This species has no clearly definied cortex, is pale drab in 

 alcohol, and has oscules about 1 mm in diameter. The surface is relatively 

 smooth. 



In the specimen in this collection the spicules are : calthrops, each ray 

 70 (X by 500 /t; oxeas, 50 ^u, by 2,000 fx plus; spirasters, 15 /u, long; 

 metasters, 40 /x; microrhabds, 3 /a by 200 ^i. 



Holotype. — U.S.N.M. 



Type locality. — West Indies. 



Distribution. — ^West Indies and Gulf of California. 



