0)1 Luceniaria fjuadriconiis and related Species. 221 



XXV. — Notes on Luceniaria qua(lricoini«t, Midler, and related 

 iSpeei'es. By liicnARD Elmhikst, F.L.S., Superintendent 

 ot" the Alillpoit Marine Biological Station. 



I.Hcernaria quadricoruis, O. F. Miiller, Haeckcl^ System der 

 Medusen, p. 390 (1880). 



Lucernaria quadricornis, Miiller, Beaumout, \l. Ann. Rep. L. M. B. C, 



p. 31 (1892). 

 Haliclystus sp. (? n. sp.), Beaumont, L. M. B. C. Reports upon the 



Fnuna of Liverpool I3av, p. 159 (1895), reprinted from Trana, 



Liverp. Biol. Soc. vol. vii'. pp. 253-203 (1894). 



The original Clyde record for fliis species is given by 

 Dr. Johnston (1847) as found by Mr. Jo.shua Alder " adhering 

 to stones at low-water mark at Ardrossan, in May, 1846." 

 This record lias since been re|ieated in various lists etc. In 

 the Annual lleport of the Millport Station for 1904 Dr. 

 Russell records Lucernaria sj). ?, from Bennan Head, S. Arran. 

 In 1909, when collecting Depastrum near this station, I 

 found several specimens of a Lucernarian which could not 

 readily be assigned to any known species, owing to the 

 presence of singJe capitate tentacles in some of the marginal 

 bays. In 1919 Prof. Genimill found a similar s))ecimen, and 

 I proem cd another in Vidlin Voe, Shetland.^, in Feb. 1916. 



In 1894 the lateW. I. Beaumont, m a note on Lucernarians 

 occurring in the neighbourhood of Port Erin, Isle of Man, 

 describes three specimens from " undersides of stones on the 

 S. side of Port Erin Bay, where Depastrum also occurs." 

 These, in view of the paucity of material, he refers " provi- 

 sionally to tlie genus Haliclystus, as ^^Haliclystus sp. (?n. sp.)." 

 He based tiiis identification on the presence, apparently only 

 definitely observed in one specimen, of " priniarj' tentacles 

 (retaining the original tentacular structtae instead of being 

 modified into marginal anchors)," which occurred in the 

 eight marginal bays, and on the rather complicated structure 

 of the gonads, although he had already referred them to 

 Lucernaria quadricornis, Miiller (L. M. B. C Rep. 1892, 

 p. 31), and despite the fact that they hud single-chambered 

 stalks — a character distinctive of the genus Jjucemaria. No 

 further specimens of this species have occurred at Port Erin. 



The accompanying table (p. 222) shows the characters of 

 the specimens available. 



The erratic occurrence of these " primary tentacles " surely 

 indicates that they are negligible as diagnostic characters, 

 and of small significance when compared with an important 



