428 Mr. F. E. Beddard on Striated Muscles in Echinida. 



prothorace utrinque omnino rotundato, leviter vage punctato. 

 Long. 5^ liu. 



Hah. Sarayacu. 



Elliptic, glossy black ; rostrum shorter than the elytra, 

 curved from the base, striate-punctate beyond the insertion of 

 the antennae ; prothorax with the sides rounded throughout, 

 the narrow collar at the apex excepted, rather minutely punc- 

 tured ; elytra more gradually narrowed from the base, finely 

 punctate-striate ; body beneath punctured throughout. 



In its only congener, E. reflexus, the rostrum is longer than 

 the elytra and much more slender, the curved portion being 

 chiefly confined to the apical half ; the prothorax is somewhat 

 incurved behind the apex, and the elytra are more rapidly 

 narrowed behind. 



XXXYIU.—Struded Muscles 171 Echtmda. By Frank E. 

 Beddaed, M.A., F.E.S.E., Prosector to the Zoological 

 Society. 



The April number of this journal contains (p. 388) a trans- 

 lation of a short note by Dr. Otto Hamann on striated muscles 

 in the Echinida, which is evidently preliminary to the publi- 

 cation of a more detailed memoir j the gist of it is contained 

 in the following sentences : — 



" In Holothurige and Asterida I have sought in vain for 

 transversely striated fibres, but I have now succeeded in 

 finding them in the Echinida. They occur, however, only in 

 a few places, and, indeed, in places where a sudden, rapid, 

 and energetic contraction has to take place. The largest 

 foims of pedicellariffi, the pedicell. tridentes s. tridactyles^ are 



best fitted for examination The musculature which 



moves the three arms .... distinctly shows transverse 

 striation." 



The author does not refer to any previous investigations on 

 the subject, but makes his statements in such a way that any 

 one reading the note would naturally assume that Dr. Hamann 

 himself had made the discovery referred to. 



As a matter of fact the above- quoted observations are not 

 new, but sim])ly confirm the results of an investigation by Mr. 

 Patrick Geddes and myself. Our paper, " On the Structure 

 of the Pedicellariffi and Muscles of Echinus sj^hcera^'' was pub- 

 lished in vol. XXX. of the ' Transactions of the Royal Society 

 of Edinburgh ; ' a brief abstract had been previously com- 



