NO. 1 DICKINSON : SPONGES OF GULF OF CALIFORNIA 9 



and contain about 20 rows of spicules. The fibers are largely spongin, 

 containing but very little detritus. The primary dermal mesh measures 

 130 by 220 fi as an average. The second mesh is about 100 /x square. 



Holotype. — ^AHF no. 2. 



Type locality. — Tangola Tangola Bay, Mexico; Lat. 15° 45' 37" N, 

 Long. 96° 05' 24" W, Tangola Tangola Island. 



D istrib u tion. — S ame. 



Material examined. — 

 Sta. 261-34 Tangola Tangola 3- 1-34 Shore 



Remarks. — This specimen differs from Callyspongia vaginalis Lamarck 

 in the size of the oxeas, which frequently measure 5 by 150 /x with an 

 average of 3 by 80 /a as compared with an average of 3 by 50 /x for C. 

 vaginalis, which has an upper limit of 4 by 70 /x. C. ridley Burton is the 

 only species that has such large spicules. This specimen, which was col- 

 lected in Australia, has oxeas that measure 8 by 200 [x. 



The coarser dermal fibers of C. vaginalis vary from 30 to 70 /a and 

 form a mesh 130 to 400 fi in diameter. The specimen under discussion 

 shows main fibers which vary little from 25 fx and a primary mesh which 

 rarely exceeds 220 /x. The finer dermal strands of the Hancock specimen 

 measure 8 fi wide as compared with an average of 15 /j. for C. vaginalis 

 and form a mesh about 100 /x square as against 80 /a. 



This specimen is also very much smaller with tubes much shorter than 

 C. vaginalis, which has a typical tube length of 20 cm as compared with 

 1 cm. The texture is more delicate and does not exhibit the characteristic 

 conules. 



In reviewing the species of Callyspongia for purposes of comparison, 

 it was noted that the species described by Lendenfeld, 1912, p. 2, as 

 Spinosella infundibulum should not be left in Callyspongia. In general, of 

 course, Spinosella falls in synonymy to Callyspongia, but on the basis of 

 Lendenfeld's description his infundibulutn belongs in the Haliclonidae, 

 the genus Cribrochalina. 



Although this specimen is not properly from the Gulf of California 

 region, it seems expedient to include it in the present paper, since its loca- 

 tion to the south places it directly in the path which was probably followed 

 by the present sponge fauna of the Gulf of California as it migrated from 

 the West Indies. A water passage across Mexico connecting the Atlantic 

 and the Pacific existed in the late Miocene period. 



