262 . LETTEES FROM C. DAEWIN, ESQ., 



travels, by imagining a set of . . or exuviae attached to each 

 of the little discs one above the other. I have seen a row of 

 discs extending an inch in length. (The teeth on the valves and 

 on the beads on the peduncle, with their exuviations, sufficiently 

 ■ explain the mere increase in diameter of the burrow). 



I cannot explain in a letter how the discs are fixed; but it 

 is in all other Cirripedia by a cement or tissue (for I hardly 

 know which to call it), which primarily debouches at the penulti- 

 mate segment of the prehensile antennae of the larva (this cement 

 is formed by a gland, strange to say, which is certainly part of 

 the branching ovaria), and subsequently during life, in different 

 Cirripedia, either through these two same orifices, or out of two 

 fresJh or only one fresh aperture placed symmetrically or irregu- 

 larly, or again through numerous apertures placed in a regular 

 circle ; so that it is nothing unusual in Lithotrya for the discs 

 to be fixed symmetrically in a straight line. In Scalpellum the 

 peduncle is attached to the thin stem of the Coralline by aper- 

 tures, through which the cement debouches, placed quite sym- 

 metrically in a straight row along the ventral side, a new one 

 being opened at each exuviation. 



But I must stop, and not weary you. I think the drawing 

 will make you understand what I mean better than my perhaps 

 ill-expressed explanations. 



I have not yet looked at Alcippe ! But do not suppose that 

 I undervalue your kindness in having sent me the specimens; 

 but I have been working like a wretched slave at mere species, 

 and have many more months' work, and till I have completed 

 this slavery I have not heart to begin work of interest, for I . 

 think I should never get courage to resume the drudgery of de- 

 scribing species and making out synonyms. I hope this letter 

 will not bore you. 



Believe me, my dear Sir, 



Yours sincerely, 



C. Daewih". 



P.S. The accompanying specimen of, as I suppose, a Cliona 

 you can throw in the fire if of no interest to you. From northern 

 part of Patagonia. 



