448 NOTES. 



on the land Planarians of South America. Since then these animals 

 have been examined anatomically, particularly by Schultze, Metschnikoff, 

 and Hoseley, and we are acquainted with a great number of such forms 

 through the efforts of travelling naturalists (Schmarda, Moseley, F. 

 Miiller, and others). It may be stated that they are generally tropical 

 animals, though three species have already been discovered in Europe ; 

 here they live only in damp soil, under stones, while in tropical regions 

 they take long walks in the early morning, on trees, rocks, and houses. 

 I found most of those that I collected in the Philippine and Pelew 

 Islands about 12 or 14 species in such situations, and among them 

 a few of really colossal size. Of the genus Sipalium, represented in 

 fig. 53, 1 have one species which attains the enormous length of four 

 inches. A complete list of all the land Planarians hitherto described 

 is to be found in H. Moseley's ' Notes on the Structure of several Forms 

 of Land Planarians, with a Description of Two New Genera, &c.' 

 ( Quart. Journ. Mie. Sci., new ser., vol. xvii.). 



Note 85, page 187. Nemertidae are also for the most part water 

 worms, moving in the water by means of the microscopic cilia on their 

 skin. They are systematically allied to the Planarians, but distinguished 

 from them externally by their perfectly circular, elongated form, and 

 particularly by a proboscis-opening at the fore end, which is wanting in 

 the Planarians. 



Note 86, page 188. This Balearic species seems to be Talitrus platy- 

 elides, Gutrin. I have seen species of true Orchcstia, both in the Pelew 

 Islands and in the Philippines, where they live far from water, under 

 stones and brushwood, in damp woods. 



Note 87, page 188. The arboreal Neritinse usually live in mangrove 

 swamps, high up on trees. I never saw them in the water, but they 

 deposit their eggs on the surface of water, so that they are, at any rate 

 occasionally, touched or covered by brackish water. I found the follow- 

 ing species in the Philippines : Neritina dubia, eommunis, cornea, subsul- 

 cata, zic-zac, Cumingiana, plnnibea, and a few new and undescribed 

 species. 



Note SS,page 189. Giinther divides these fishes into the following 

 families : Luciocephalidae, Labyrinthici, and Ophiocephalidas. Of these 

 the first two have both the secondary cavities of the branchial cavities 

 furnished with convoluted labyrinthine folds ; the species of the third 

 family have only simple secondary cavities with feebly developed folds, 

 or none. The species of Saccobranchm, allied to the Shad, and Amphi- 

 pnous cucliia, an eel-like form, allied to the Symbranchidae, have also 

 a subsidiary sac to the branchial cavity, but without any folds. 



Note 8$, page 190. The observations of Sir Francis Day are to be 

 found in the Proc. Znol. Soo., London, 1868, Part II. p. 274. . 



Note 90, page 192. I have, in the Philippines, frequently had the 

 opportunity of observing these creatures alive, and I can assert decidedly 



