3840 Royal Physical Society of Edinburgh. 



of the tail is furnished with five pairs of teeth, instead of four, as in H. Cranehii. It 

 seemed a common species at Crail, and Dr. H. had since seen a specimen in Dr. Fle- 

 ming's collection, obtained many years ago by him in Orkney. Mysis Chameleon is 

 common in pools at low water. Besides the common Talitra saltator and Gammarus 

 lacustris, and also, perhaps, G. campylops ? whose specific distinction, however, is by 

 no means a good one, namely, that of having the eyes shaped like the letter S., Dr. H. 

 mentioned one of the carinated Gammari, agreeing with G. Sabinii of Milne-Edwards. 

 During the summer of 1851 he obtained many specimens of a small amphipodous crus- 

 tacean from the genital cavities of Cyanea purpurea, which, on examination, he found 

 to be the Hyperia Latreillii of Milne-Edwards, which is synonymous with the Gam- 

 marus Galba of Montagu, (Linn. Trans, xi.) The eyes are strikingly large, and of a 

 bright green colour. Of the Isopods, the most common are Ligia oceanica, Idotea 

 pelagica, I. tricuspidata, and I. linearis. Arcturas longicornis is brought up by the 

 lines of the deep-sea boats. Corophium longicorne occurs in pools at low water at 

 Musselburgh. The Caprellae described by Dr. Johnston in his ' Illustrations of Bri- 

 tish Zoology,' in Loudon's Magazine for 1835, are, Caprella Phasma, C. acanthifera, 

 C. Pennantii, and C. linearis. Milne-Edwards and Dr. Johnston, although giving the 

 same synonyme, are evidently describing different species when they refer to C. acu- 

 minifera of Desmarest, which is adopted by Dr. Johnston as C. acanthifera. He de- 

 scribes and figures it with a spine on the head, and with the terminal segments of the 

 body smooth. Milne-Edwards, again, gives his C. acuminifera a smooth head, but a 

 tuberculated body. In a specimen found by Dr. H. at Crail, which corresponds in 

 some respects with that species, the head has a small obtuse spine, and the last three 

 segments of the body are much tuberculated. The inferior antennae are strongly cili- 

 ated beneath. Another species met with by Dr. H., while dredging at Prestonpans, 

 resembles in some respects C. Phasma ; but, besides having a spine above the origin 

 of each of the second pair of limbs, it has two larger ones placed side by side on the 

 dorsal aspect of that segment. The hands of the second pair of limbs have three teeth 

 on their under surface. Two specimens taken by Dr. H. last October had attached 

 themselves by their posterior limbs to an Antennularia ; on gently touching them they 

 moved up and down rapidly, the articulation between the second and third segments 

 acting as a hinge-joint. In conclusion, Dr. H. mentioned four species belonging to 

 that curious family the Pycnogonidae. The first and most common is Pycnogonum 

 littorale, which is plentiful under stones at low water, and also often dredged in three to 

 five fathoms. The next in frequency is Nymphon femorale, or hirtum of Fabricius, 

 which is frequently met with on shelly ground, especially about Inch Michry. Nym- 

 phon gracile appears to be much scarcer than either of the preceding. On Corallina 

 officinalis, in a pool at Joppa rocks, Dr. H. found a specimen apparently belonging to 

 the genus Phoxichilidium. It differs from any of those described by Milne-Edwards 

 or Mr. H. Goodsir in the * Edinburgh Philosophical Journal;' its colour was exactly 

 that of the coralline. 



Dr. John Alex. Smith next exhibited a specimen of a duck which was shot in De- 

 cember, 1851, near the Bass Rock, by some boatmen, who, from its unusual appear- 

 ance, brought it to one of the Edinburgh bird-stuffers. Dr. Smith said he had been 

 puzzled to find out what it was ; but by the kind assistance of one of our celebrated 

 ornithologists, he learned that it was a West Indian species, — the Bahama duck, — 

 the Anas Bahamensis of Catesby's ' Carolina,' the Anas urophasianus of Vigors ('Zoo- 

 logical Journal,' iv. 337), the Dafila urophasianus of Eyton's ■ Duck Tribe,' and the 



