Prodromus of the Lucernarice. 531 



facing the odd tentacle, the large pair of tentacles round 

 the mouth is quite prominent in this figure. 



Fig. 5. Figure 3 seen from the broad side to show the 

 mode of arrangement of the tentacles of the two sets of 

 tentacles, the odd tentacle is on the left of the figure, the 

 last formed pair on the right. 



Art. XII. — Prodromus of the History, Structure, and 

 Physiology of the order Lucernarice. By Prof. 

 Henry James-Clark, of Harvard University, Cam- 

 bridge, Mass. 



[Communicated January 7th, 1863.] 



In the month of September, 1862, 1 discovered upon our 

 coast a Lucernarian, Halimocyathus platypus, H. J. C, 

 which differed in such a remarkable degree from the most 

 commonly known form, Haliclystus auricula, H. J. C, that 

 I deemed it to belong to a different family from the latter ; 

 but in order that there might be no lack of correlative con- 

 firmation, I obtained, by the help of friends, sufficient 

 materials to warrant me in making a complete revision of 

 the whole order. This I now present in the form of a 

 prodromus, rather than an elaborate treatise, simply be- 

 cause I desire at the earliest possible time to incite natu- 

 ralists to a closer investigation of the habits, structure, and 

 relations of this remarkable order, and moreover that by 

 their labors I may profit whilst working out the memoir 

 which I have had in preparation for many months. 



LUCERNARI^.* H. James-Clark. 



An order of pedicellated Acalepha3. 



The disc more or less octagonal or circular, and varying 



* See my paper entitled " Lucernaria the Ccenotype of Acalepha;." Proceed- 



MARCH, 1863. 



