GENERAL ZOOLOGY. 



25 



tit tlie Admiralty Islets it acquires a mucli larger size, and is decidedly 

 more plentiful "One specimen of Siplionaria denticidata, Q. & G., common 

 to Port Jackson and New Caledonia, was taken on Rabbit Island ; and 

 several examples of Scutus unguis, Linn., var. corrugatus, Eeeve were found 

 on the Coral-reef. The Chitonida are sparsely represented by a small 

 Chiton, and two species of AniUcUtes, and were attached to stones on the 



Coral-reef. ^ , -, ^, 7 . 



Dead specimens of Triton cynocephaUs, Lamk., and Fterocera chiragra 

 var. rugosa, Sby., were found, but Mr. Brazier, without additional 

 cridence, is disinclined to regard these as other than convoyed to the island 

 through human agency. They are New Caledonia species, and have not 

 been traced so far'to the south-east before. 



The relative prevalence of Patella and Siplionaria seems to be exactly tiie 

 opposite of the Eev. J. B. T.-Wood's experience on the north-east coast ot 

 the Continent. In the neighbourhood of Trinity Bay he found Siplwnaria 

 to be the characteristic genus, whilst in our own case it is Patella.- ^ 



The remaining groups of the Cxasteropoda are but feebly represented m 

 our collection. Of the Tectibranchiata we have only three Bulla, Ilcuro- 

 hranclun, and Aplysia. The former is represented by .a few examples ot 

 P. ampulla, but all dead specimens ; the latter by Aplyna tignna, iiaiig. 



The Nudibranchs would probably reward a more vigorous search than we 

 were able to give, two genera only coming under our notice, a species ot 

 Onchyclium, and Bolahrifera Brazeri, Sby. The Heteropora are of more 

 importance from the plentiful occurrence of lantUna. ihis beautitul genus 

 is represented by two species— i. casta, Eeeve, and J exigua, Lamk. iie 

 former is scattered in thousands on the sandy beach of the Lagoon, invariabv 

 coming on shore with the mollusc in situ. The latter is the beautiful high- 

 spired species, with the well marked sinus m the outer lip of the mouth. From 

 amongst the immense number of the commoner form examined by us, only two 



specimens of this species were found. ■. ^e ■ ^n,.fni,nl,r 



The group to which the greatest mterest '-attaches itself ^cei a nl} 

 the Puimonifcra. Thanks to the untiring exertions of Mr. Wh ekgge 

 we are able to extend this division of the Mollusca by no less than seven 

 undescribed species. A curious resemblance exists to some extent between 

 Lord Howe Island and the Sandwich Islands. Not only are both wide j 

 isolated, but in the former the land shells are said by Wallacot to be ]icculiai 

 to the group, and they are certainly so in the case of Lord Howe. A 

 further resemblance takes place in the very small number of Operculate 

 Pulmonifera existing on both groups of islauds-m the case of our is and 

 only three genera. More attention has been paid to the land shells ot 

 Lord Howe than to any other group of Mollusca found there through ttio 

 researches of Pfeiffer, Cox, Brazier, and Gaskom and collections m^de by 

 the late Mr. Macgillivrav, Mr. G. Masters, and Mr. A. Morton. Pi on a 

 short note by M?. Brazier in 1809,1 it appears that Macgi hvray alone 

 collected four species of Relix, a Bulimns, four Diplommatma, and an 



Omplialotropis. , , . ^i, ^ +„,,;^„i 



The genus Helix is represented by no less than ten species Ihe ty pica 1 

 form, characteristic of Lord Howe, Helix Soplnw, Gaskoin,§ is scattered 

 freely over the whole island, and extends to a comparatively high ^ititudo 

 on Mount Ledobird. In the lower lying portions of tlio island, m 



* Proc. Linn. Soc. N. S. Wale?, v, pt. 2, p. 112. 



t Island Life, 1880, p. 303. ^^ ^ „„ . ,^ „ ir,,-,\ ,> H 



X " Lord Howe Island," Sidney Uonimff Herald, 1869, Lix, No. 9,694 (June 16th), p. 8. 

 § Proc. Zool. Soc, 1851, p. 152. 



