ART. 4 SPONGES OF CALIFOENIA de LAUBENFELS 75 



by 130/x. Microscleres, rliaphides (fig. 40, 5) ; size 1/2^1 by 95^ to Iju, 

 by 140^. 



Remarks. — The other member of this genus, A. planus Topsent 

 (1927, p. 9), has tylotes of double the measurements of those of 

 arndti and a few toxas in addition to diactinal rhaphides. As a mat- 

 ter of fact amdti is very close to the genus Hyinedesmia from which 

 it may be derived. It is interesting to compare it to Hymenainphias- 

 tra eyanocrypta from the same general locality. A. amdti has much 

 smaller acanthotylostyles, which further play a very insignificant 

 part in the sponge as a whole, the bulk of it having only tylotes. In 

 cyanocrypta the tylotes are more distinctively just dermal spicules, 

 and, of course, there are the very peculiar microscleres. A further 

 noteworthy difference is in the shape of the ends of the tylotes, which 

 in ai'ndti are ball-like, nearl}^ spherical ; in cyojnocrypta they are 

 elonffate-oval with hastate terminations. 



'to' 



Family MYXILLIDAE Topsent 

 Genus LISSODENDORYX Topsent 



LISSODENDORYX KYMA de Laubenfels 



Lissodendoryx kyina de Laubenfexs, 1930, p. 27. 



Holotype.—V.S.'NM. No. 21511 ; B.M. No. 29.8.22.60. 



Type locality. — The one specimen was growing on the macerated 

 dictyonine skeleton collected by E. F. Ricketts, on May 9. 1929, in 

 !Monterey Bay, Calif., depth 700 meters. 



FiGtRE 41. — Lissodendoryx kyma de Laubenfel.s, X300 



DescTiption. — Shape, encrusting. Size, 5 mm thick, 28 mm in 

 diameter. Consistency, fragile and friable. Color in life and when 

 dry, pale drab. Oscules and pores, not evident. Surface, super- 

 ficially wavy, with the troughs about 2 mm deep. 



Ectosomal specialization, an indefinite sort of dermal membrane, 

 not detachable; it is packed with tangentially })]aced tornotes. 

 Endosomal structure, " crumb-of-bread,-' with large styles in con- 

 fusion. 



