MOLLUSCA. 
469 
APLYSIIDiE. 
The coloured fluid ejected by Aplysia depilans (L.) shows the same che- 
mical reactions as aniline-red and aniline-violet. Ziegler, Bulletin de la 
Soci^t^ industrielle de Mulhouse, 1867, and .Journal fiir praktische Chemie, 
1868, January. 
Dolahrifera fusca and tahitensis, spp. nn., Pease, Am. Journ. Conch, iv* 
pp. 76, 77, pi. 8. figs. 4 & 6, Tahiti. 
Aplysia^ sp. indeterm., from Vigo Bay, and A. hyhrida (Sow.). Lingual 
dentition figured by Hogg, Trans. Roy. Microscop. Soc. xvi. pi. 10. figs. 4L 
42 ) jaw, fig. 42 a. 
Syphonota viridescens, Kingsmill Islands, and punctata^ Huaheine, spp. nn.. 
Pease, I c. p. 77, pi. 10. fig. 1, & pi. 9. fig. 2. 
Umbrella mediterranea (Lam.), lamarckiana (R^cluz), and indica (Lam.), 
Kiister, Conch, sect. 66. pp. 3-5, pi. 1. figs. 1-4, 6, 6, & 7. 
Pleurobranchid^e. 
Fleur obranchaea meckelii (Leue), Pleurohranchus testudinarius 
(Cantr.), and tuberculatus (Meckel) secrete free sulphuric acid. 
The organ for this secretion is that which has been called by 
previous anatomists arboriform or accessory salivary 
gland : it is of tubular structure ; and its branches extend far 
into the visceral cavity of the animal, embracing the stomach, 
and opening in the upper commissure of the mouth, whilst the 
true salivary glands, called semiorbicular gland by Leue, 
and pancreas by Delle Chiaje, open between the jaws. The 
fluid is expelled when the animal tries to bite, colouring the 
surrounding water reddish, if it has been previously mixed with 
litmus ; but the acid does not appear to be swallowed, as cal- 
careous particles contained in the food (for example, crystals of 
the skin of some Tunicates) are found intact in the stomach of 
the animal. Panceri, Ann. Sci. Nat. vol. x. pp. 92-94. 
Pleurohranchus plumida (Mont.). Lingual dentition and jaw by Hogg, 
Transact. Roy. Microscop. Soc. xvi. pi. 13. fig. 79. 
Pleurohranchus grandis, Huaheine, ovalis, Tahiti, dclicatus, Huaheine, and 
tessellatus, locality ?, spp. nn. Pease, Am. Journ. Conch, iv. pp. 78-80, pi. 10. 
fig. 2. pi. 9. figs. 3, 1, 4. 
NUDIBRANCHIATA. 
PHYLLIDIIDiE. 
PhylUdia 7ugra, sp. n.. Pease, Am. Journ. Conch, iv. p. 80, pi. 9. fig. 5, 
Tahiti. 
Doridid>e. 
Oncidoris hilaynellata (L.). Ungual dentition by Hogg, Transact. Roy. 
Microscop. Soc. xvi. pi. 10. fig. 43. 
