Mr. H. J. Carter on Spicules of Spongilla. 329 
Fig. 5. Ectyonopsis ramosa, u. sp., spiculation of: a, axial form; 8, 
echinating form. W. coast of Australia. 
Fig. 6. Phakellia ventilabrum, Bk., diagram of skeletal or spicular struc- 
ture: aa, mesial plane; 6566, scopiform processes. Shet- 
land. 
Fig. 7. Ptilocaulis rigidus, n. sp., fragment magnified two diameters, to 
show scopiform processes: a, stem; 66066, processes. ?S. Aus- 
tralia, 
Fig. 8. Ptilocaulis gracilis, n. sp., terminal end of a branch, nat. size. 
West Indies. 
Fig. 17. Phileodictyon singaporense, n. sp., spiculation of: a, skeletal 
spicule of fibre ; 6, smaller spicule of dermal layer. Singapore. 
PLATE XLV. 
Fig. 9. Phakellia ventilabrum, Bk., spiculation of: a, vermicular form; 
b, acuate. 
Fig. 10. Phakellia ramosa, n. sp., spiculation of: a, acuate; b, acerate ; 
c, bihamate ; d, trichites. 
Fig. 11. Phycopsis hirsuta, n. sp., spiculation of. One form only, viz. 
acerate, 
Fig. 12. Phycopsis fruticulosa, n. sp., spiculation of. One form only, 
viz. acerate, 
Fig. 13, Prilocaulis gracilis, n. sp., spiculation of. One form only, viz. 
acuate. 
Fig. 14. Ptilocaulis rigidus, n. sp., spiculation of. One form only, viz. 
acerate or subacuate. 
Fig. 15, Leucophleus massalis, nn. gen. et sp., spiculation of two speci- 
mens, Viz. :—a, acuate of Dr. Bowerbank’s specimen ; 6, acuate of 
specimen in the British-Museum general collection. 
Fig. 16, Leucophleus compressus, n. sp., spiculation of two specimens, 
viz. :—a, acerate of specimen described; 6, acerate of no. 534. 
XXXVII.—Spicules of Spongilla in the Diluvium of the 
Altmiihl Valley, Bavaria. By H. J. Carrer, F.R.S. &e. 
[Plate XIV.] 
So far back as the 3rd March, 1881, Professor Zittel, of 
Munich, kindly sent me some pieces of dark brown argilla- 
ceous diluvium from the valley of the Altmiihl, in which he 
had recognized spicules of a Spongilla (Pl. XIV. fig. 18, a, 
6); but, partly from want of opportunity and partly from 
want of the necessary knowledge, I have not been able to 
record publicly the results of my examination of it until the 
resent time. 
This freshwater deposit, besides the skeletal spicules men- 
tioned (fig. 18, a, 6), which, from their spiniterous character, 
appear to me to be most nearly allied to those of Spongilla 
(Meyenia, Crtr.) ertnaceus, Ehr., contains another kind which 
are quite new to me (fig. 18, c—f), together with the detritus of 
