50 Scientific Proceedings, Roijal Duhlin Society. 



advanced in this specimen, which was taken in an August haul. The others 

 examined were captured iu them onths of May and August. Orton, (1914, 

 pp. 232-4) has given recent notes and figures of this species from Plymouth 

 specimens. 



Distribution. — British and Norwegian seas, Mediterranean. 



Phyllophorus pellueidus (Flem.). 



Holothuria pelhicida, Flem., 1828. 

 Cucumaria hycdina, Forbes, 1841. 

 I'hi/onidiuvi pellucidtcm, Diib. & Kor., 1846. 

 Phyll. 23elhicidus,'Be\\, 1892. 



A specimen in the Irish ISTational Museum, taken off S.-W. Ireland, in 

 50 fms., by the E.I. A. Exp. (Sladen, 1891), measures 74 mm. in length, and 

 has a collar of 6 mm., with no prolongations. The tentacles are 19 in 

 number. The gonad contains 60 tubes of 3-16 mm. A few are bifurcated, 

 and about half are so branched as to equal about 10 simple tubes. There 

 is one long, narrow polian vessel. I have not been able to see the specimen 

 from Strangford Lough referred to C. hycdina (Hyndman and Thomps. 

 f. Dickie, 1858), and, as noted (p. 52), the other Irish records appear to be 

 referable to Ps. mixta. 



Distribution. — Arctic seas, British Islands, and "West Indies. 



Phyllophorus Drummondi (Thomps.). 



Cucumaria Drummondii, Thomps., 1856. 



Thyone Portlockii, Forbes, 1841. 



Thyonidium commune, Diib. & Kor., 1844, and Theel, 1885. 



Phyllophorus drummondii, pro parte, Bell, 1892. 



(non Thyonidium duheni, Norman, nee. 



Sempe7'ia drummondi, Herouard, 1889. 



"We have not taken any specimens of the above in our investigations. 

 The records given by Nichols (1903, p. 244), on account of the insufficient 

 descriptions of the old writers, cannot be relied upon unless the specimens 

 are extant. Mr. Nichols has courteously allowed me to examine the only 

 two examples in the Irish National Museum. These specimens measure 

 70-92 mm. in length, less tentacles. Each has at some previous time been 

 more or less cut open for investigation, so that it is possible that they 

 may be type and co-type specimens of Forbes. The smallest specimen 

 is labelled " Phyllophorus drummondi, Thomps. = Thyone portlocki, Forbes, 

 Belfast Bay, Ord. Surv. Coll." The type of Forbes is described as measuring 



