1887.] NATURAL SCIENCES OF PHILADELPHIA. lU'.l 



S. lacustris, var. lehighensia, Potts;. (PI. VII, tig. v.) 



In this variety we find the skeleton and dermal spicules normal, 

 while those of the gemmules are disproportionately large. The 

 gemmide itself is relatively small, with an unusually thick granular 

 crust, through which, embedded like chevaux de frise, the spicules 

 project their points, crossing their lines in every direction. These 

 are long, cylindrical, with long spines ; those near the extremities 

 often recurved ; terminations acute. 



Loc. Lehigh river Pennsylvania, near White Haven. 



Meas. Diameter of gemmule 0.016 inches. Skeleton spicules 

 0.01035 by 0.00045 inches. Length of dermal spicule 0.002 ; of 

 gemmule spicule 0.004 inches. 



A somewhat similar form was collected at May's Landing, New- 

 Jersey ; but in this the chitinous body was very thick ; the granu- 

 lar crust less conspicuous ; the spicules fewer, larger, and less regu- 

 lar in position and character. (PI. VII, fig. iv.) It may be briefly 

 described thus : — 



Sponge green, encrusting ; not conspicuously branched. 



Gemnuiles small, crust thin, enveloped in a specialized capsule of 

 interlacing skeleton spicules. 



Skeleton spicules stout, sub-fusiform, smooth, gradually pointed. 



Dermal spicules rather large. 



Gemmule spicules variably robust, abundantly spined ; spines 

 long, acute, retrorse. 



Mea.i. Length of skeleton si)icules 0.0105 ; of dermal spicules 

 0.0021 ; of gemmule spicules 0.004 inches. 



Loc. May's Landing, N. J. 



(3) Spongilla (Euspongilla) rhenana, Uetzer. See "Diagnosis." p. 174, etc. 



(4) Spongilla alba, Carter. Ann. etc. 18SI p. 88. 



"Massive, spreading, sub-branched. Structure fragile, tomentose. 

 Color whitish. Skeleton spicule curved, fusiform, gradually shar])- 

 pointed, smooth. Flesh S])icule thin, curved, fusiform, covered with 

 spines, longest in the centre where they are vertical and obtuse. 

 Statoblast globular ; aperture infundibular ; crust thick, white; com- 

 posed of granular cell-structure, charged with minute thick acerates, 

 which are curved, cylindrical, round at the ends, covered with spines 

 (especially about the extremities where they are longest and nmch 

 recurved), arranged tangentially, intercrossing each other like ilu-. 

 linesof an engine-turned watch-case." Carter. 



Loc. Bombay. 



