On the Cirripede Genus Stramentum. G5 



according to Tescli's key (Zool. Meded. Leiden, iii. 1917, 

 p. 235), into the neiglibonihood of S. eydouxi^ M.-E., and 

 8. granos'imanay Micrs. In the former species, as redescribed 

 by Tesch (/. o. p. 150), the upper margin of the palm of the 

 chelipeds is provided with a "distinct, liorny-coloured, granu- 

 lafce crest," and the outer surface is very minutely granulated 

 and has a short oblique ridge about themiddhs In S.grano- 

 simana, of which I have examined the two syntypes, the 

 outer surface of the palm is rather coarsely and evenly granu- 

 late, its upper mnrgin has a low denticulate crest, the upper 

 margin of the immovable finger is (excejU for a notch near 

 the base) nearly straight, and the walking-legs have no 

 brushes of short fur on the anterior surface of the carpus and 

 j)r<j[)odu.s of the first three pairs as they have in S. deJuutni 

 and S. boulengeri. 



The specimens of S. boidengeri presented to the Museum 

 thirty-six years ago were accomjjanied by a note on the 

 habit.s of the species by the collector, Mr. Lionel E, Adams, 

 as follows : — " Collected at Basra, 60 miles up the Euphrates, 

 in pi'rfectly fresh water ; burrows in the banks of the river 

 and especially in a canal in connexion with the river, where 

 it climbs the fibrous roots of trees laid bare to the extent of 

 6 or 7 feet at low tide (there being 4 or 5 feet of tide at 

 Basra) by the aid of the large claws. Sometimes they ascend 

 the trunks to the height of 10 feet." 



VI. — The Cirripede Genus Stramentum (Loricula): its Histonj 

 and Structure. By Thomas H. Withers, F.G.S. 



[Plates lit. & IV.] 

 (IViblished by permission of the Trustees of the British Museum.) 



Introduction. 



Although the cirripede generally known as Loricula is 

 repicscnted by more specimens approacliing completeness 

 than is any other Cretaceous cirripede, still our knowledge 

 of its structure has not greatly advanced since 1851, when 

 Darwin redescribed Loricula ptc/chellu, Q. B. Sowerby, the 

 first-discovered member of the genus. Particularly docs this 

 api)ly to the numlicr, structure, and homologies of the 

 capitular valves and to the peduncle when complete, on 

 which points there have since been wide ditt'crences of 

 opinion. 



Ann. cf; Mag. N. Hist. Scr. 0. \'ul. v. 5 



