No. L—REPORT ON THE CALCAREOUS SPONGES COLLECTED BY 
H.M.S. “SHEALARK” IN THE INDIAN OCEAN. 
By ArtHur Denpy, D.Sc., F.R.S., F.L.S., Professor of Zoology in the 
University of London (King’s College). 
(With Plates 1—5.) 
Read 3rd April, 1913. 
THE collection of calcareous sponges comprises only thirteen recognizable species, viz. : 
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1. Leucosolena gardineri n. sp. 2 
2. Dendya prolifera n. sp. . > ae ‘ : E 6 
3. Leucascus simplex Dendy  . : : 9 
4. Leucetta chagosensis n. sp. . : : : : 10 
5. Leucetta pyriformis n. sp. . 5 11 
6. Perrcharax heteroraphis Poléjaett . ; : é 13 
7. Pericharaw peziza n. sp. A : 15 
8. Leucaltis clathria (Haeckel) . : : : 16 
9. Grantessa hastifera (Row) . : ; 19) 
10. Grantia indica n. sp. . : ; : : ; 20 
11. Leucandra echinata Schutiner ; 23 
12. Leucandra wasinensis (Jenkin)  . ; 24 
13. Leucilla proteus n. sp. . : 65) 
Tt will be seen from this list that, though small, the collection contains a number of 
very interesting forms. Thus the genus Dendya has hitherto been known only from a 
single Australian species, D. tripodifera. Leucascus, another Australian genus, has only 
been recorded once since first described by myself in 1892. The genus Pericharax has 
not been met with since it was obtained by the “Challenger” and described by Poléjaeff 
in 1883, and the “Sealark” Expedition has not only rediscovered the type species but 
has also added a new one. Grantessa hastifera is a remarkable species only recently 
described by Row from the Red Sea under the name Grantilla hastifera, and its re- 
discovery by the ‘“‘Sealark” has given the opportunity for reconsidering its systeniatic 
position. The most conspicuous and abundant species in the collection is Leucaltis 
clathria (Haeckel), hitherto generally known as Heteropegma nodus-gordi Poléjaeft, which 
appears to enjoy a remarkably wide distribution and has been described by various authors 
under different names. 
SECOND SERIES—ZOOLOGY, VOL. XVI. 1 

