AND MONSTROUS FORMS OF MEDTJSvE. 525 



pened to procure were forms which had not been previously 

 described. Unfortunately I omitted to make any drawings of 

 these new species ; but probably I shall have the opportunity of 

 doing so next year, and, if so, shall then hope to have the privilege 

 of submitting the drawings to the consideration of this Society. 

 Meanwhile, however, it seems desirable to communicate to the 

 Society a brief verbal account of these hitherto undescribed 

 species. They were all obtained between the months of May and 

 August, in the Cromarty Frith on the east coast of Scotland. 



1. A species of the genus Tiarops. — Nectocalyx about an incli 

 and a half in diameter, and of a hemispherical form. Manubrium 

 of great proportional size (viz. about f inch long), and in geaeral 

 shape somewhat resembling that of Geryonia appendiculata. Ten- 

 tacles numerous, and proportionally shorter than in T. diademata. 

 Diadems eight in number, and disposed as in T. diademata. Pearly 

 nodules twelve. The animal is luminous when irritated — the 

 light being of a pale phosphorescent hue, and restricted in its po- 

 sition to a narrow but continuous line all round the margin of 

 the nectocalyx. Individuals of the species are very numerous iu 

 the locality above mentioned. For the species itself I propose 

 the name Tiarops indicans. 



2. Another species of the same genus. — Nectocalyx about 

 half the size of that in the species just described, and, together 

 with the manubrium, in general form resembling that of Thau~ 

 mantias lucida. Diadems eight in number, and disposed as usual. 

 The pearly nodules in each diadem vary from 6 to 8. Tenta- 

 cles 22. Animals non-luminous, and of tolerably frequent occur- 

 rence. For this species I propose the name Tiarops oligoplocama. 



3. Another species of the same genus. — Nectocalyx inter- 

 mediate in size between those of the two above-described species, 

 while in form it is considerably more concavo-convex, resem- 

 bling a deeply shaped bowl. Manubrium so small as to be almost 

 invisible, and, together with the nutritive tubes, ovaries, and 

 tentacles, of a rich rose-colour. Tentacles 45 in number, and 

 arranged in two series, in one of which the tentacles are long, 

 and in the other short. Unlike all the known species of this 

 genus, the present onehas/b?/r diadems bettveen each pair of radial 

 tubes — there being thus altogether sixteen diadems, or twice the 

 usual number. All the diadems are arranged iu a strictly sym- 

 metrical manner, and each contains about 30 pearly nodules. 

 The animal is brilliantly luminous when stimulated, the light. 



