19S REPORT— 1866. 



near tlic same spot ; and as his figure and descviptionf were scarcely sufficient 

 for positive identification, the rediscovery of this Holothurian is important. 

 As among the rarer of the other Echinodermata which were obtained may 

 be mentioned Psolus phantcqnis, Thyone fusus, and raphanus, Thi/onidhon 

 commune yonng (?), and InjaJimnn, Cuciimaria lacfea, fusiformis, and Hynd- 

 manni, Brisso2)sis lip'ifera,Asterias hhpida, Porania pidviUus,Opk'mra affinis, 

 awA Amphiura Badii, Jillformis, and Chiajii. 



The Polyzoa include sixty-six species. In the Appendix wiU be found 

 descriptions of many new forms : — a Scrupocellaria differing from S. scru- 

 posa in ha\dng larger cells, which do not bear any spines, in the propor- 

 tionately larger vibracular capsules, and in the form of the mandible of the 

 avicularium, which is blunter and shorter ; aLepralia, allied to the incrusting 

 Lepralia-Y\kc state of Eschara Lnndshorovii ; another remarkable on ac- 

 count of its much elevated collar-like peristome ; a new EscJiara, and an 

 Alecio allied to A. dilatans. There is also an uudescribed Alcyonidium : but 

 the species of this genus are very difficult ; and not having examined the 

 present form in a living state, I have not attempted to define it. One or two 

 small fragments of Brettia pellucida, Dyster, give a second locality for this 

 Polyzoan, at a considerable distance from Tenby, where the type was found. 

 Several rare northern Polyzoa, which had not previously occurred to the 

 soiith of Shetland, are now traced southwards to the Minch — C'aherea EUisii, 

 Fleming, Lepndia polita, Norman, Leprcdia laqueata, Norman, Idmonea At- 

 lantica, Eorbes, Hornera horecdis, Busk, &c. ; and on the other hand we were 

 greatly surprised by the well-known Eschara foUaeea turning up ia this 

 northern locality, since it is an- essentially southern species, which has not 

 previously, I believe, been noticed to the north of Cape Clear. 



Turning to the Actinozoa, the neighbourhood of Skye is the well-known 

 habitat of Pavonaria rpuidrangularls, although the only place which produced 

 it during the recent dredging was Loch Alsh. The rediscovery of Rhizoxenia 

 agglomerata, Forbes* — although a mere fragment was obtained — is well 

 worthy of special mention ; but perhaps the most interesting of all the results 

 of the expedition is the occurrence of a second species of Pennatida in oiu- 

 seas, which will be described by Mr. Alder under the name of Pennatula 

 mollis. 



The Hydi'ozoa are not numerous, amounting to only thirty-two species, 

 Sertidaria (data, Hincks, and Calicella fastlgiata. Alder, had up to the 

 present time been regarded as peculiar to Shetland ; the little Sertidaria 

 fusiformis, Hincks, and the pretty Phimidaria tuhidifera, Hincks, not known 

 previously on the Scotch coast, have now their range considerably extended 

 northwards ; and in the Appendix there are characters of two Halecia, new 

 to science, one of which, Halecium genictdafum, is remarkable on account of 

 its flexuous hydrosoma, which is bent alternately right and left between the 

 hydi'otheca;, and on account of the great length of the simple tubidar hydi-o- 

 thecae ; the other, Halecium sessile, may be distinguished by its very small 

 and perfectly sessile hydrotheca;, and by the veiy large non-retractile poly- 

 pites. 



The Sponges have not as yet been determined. It is, however, worthy of 

 mention that three species peculiarly characteristic of the Haaf of the Shet- 

 land seas were living in the Minch, enjoying the companionship of many 

 other of their northern friends. These species were Tetliea cranium, Midler, 

 Isodictya infund ibuliformis, Linn., and Phal-ellia ventiJahrum, Linn. 



Appended will be found a catalogue of all the species found, descriptions 



* Sarcodidyon agglomerata, Forbes, Trans. Eoy. Soc. Ediu. vol.xx.p. 309, pi. 9. fig. 3. 



