i 



Mr. L. de Nic^ville on Papilio nebulosus, Butler. 385 



EXPLANATION OF PLATE XVIII. 



N.B. All the spicules are drawn to the scale of l-12th to l-1800th 

 inch, except fig. 9, which is on the scale of l-24th to l-6000th inch, and 

 the " more magnified " flesh-spicules in figs. 1 h, 2 h, 3 e, 4 b, and o b, 

 which are on the scale of l-12th to l-6000th inch. Figs. 3 and 6 are of 

 the natural size, and fig. 3, a, b, enlarged views of the former. 



Fig. 1. Discodermia sinuosa, n. sp. a-e, transformation of the disk to the 

 lithistid form ; /, interlocking of the filigreed extremities in the 

 fuUy developed spicule ; ff, flesh-spicule ; h, more magnified 

 view of the same. 



Fiff. 2. Discodermia sceptrellifera, n. sp. a-e, transformation of the disk 

 into the lithistid form ; /, interlocking of the filigreed extremi- 

 ties in the fully developed spicule ; ff, flesh-spicule ; h, more 

 magnified "view of the same. 



Fiff. 3. Axos anchorata, n. sp. (nat. size), growing on a mussel-shell. 

 a, magnified view of surface ; b, the same of internal structure 

 in the transverse section ; c, vents ; d, skeleton-spicule ; e, flesh- 

 spicule ; /, the same, more magnified. 



Fig. 4. Axos Jibuiata, n. sp. a, skeleton-spicule; h, flesh-spicule; c, the 

 same, more magnified. 



Fig. 5. Latrunculia inirpurea, n. sp. a, skeleton-spicule ; J, flesh-spicule, 

 a sceptrellum ; c, the same, more magnified. 



Fig. 6. Cliona Warreni, n. sp., in situ, a, Melobesian nodule ; b, pore- 

 head ; c, vent ; d, spicule. 



Fig, 7. DictyocyUndrus reticidatus, n. sp. a, skeleton-spicule ; h, flesh- or 

 echinating spicule ; c, the same, more magnified. 



Fig. 8. Acanthella stipitata, n. sp. Skeleton-spicule. 



Fig. 9. Halicliondria infrequens, n. sp. a, skeleton-spicule ; b, " tibiella " 

 or subskeleton-spicule ; c, flesh-spicule, bihamate; d, flesh-spi- 

 cule, equi.'iuchorate, front and lateral views. 



Fig. 10. Hotalia arenacea, n. sp. a, trochoid portion ; J, flat rim. 



XXXVII. — Note on Papilio nebulosus, Butler. 

 By Lionel de Niceville. 



In the Ann. & Mag. of Nat. Hist. 5th ser. vol. vii. p. 33. 

 n. 2, pi. iv. fig. 3, Mr. A. G. Butler describes and figures a 

 new Fainlio from Darjiling under the name of nebulosus. 

 The Indian Museum, Calcutta, has lately had presented to it, 

 by Capt. G. F. L. Marshall, K.E. (to whom Mr. F. DuCane 

 Godraan gave one of the specimens which had recently been 

 purchased by him at Darjibng), a very similar (male) speci- 

 men. On the upperside it differs from P. nebulosus in the 

 ground-colour of the whole of the fore wing being dull black, 

 except that portion of it which is internal to the subbasal 

 black band present in ordinary Sikkim specimens of P. anti- 

 fhates^ Cramer, and which in my specimen is sap-green in- 

 stead of cretaceous white. In P, nebulosus there are said to 



