256 LETTEKS FROM C. DAEWIJST, ESQ., 



No. 4. 



(Postal date Dec. 26th, 1849.) 



Down Parnborougli, Kent, 



Dec. 25tli. 



My dear Sir, 



I am very mucli obliged for your last very interesting 

 letter, with your answers to all my queries, and the copy of your 

 paper, which I am very glad of, though I take in the Annals. 



I have not yet looked at Alcippe, for I have found my writing 

 work run out, and I have lately received several new peduncu- 

 late species to describe. I have had such a misfortune in the 

 loss of a parcel of Cirripedes from Copenhagen, amongst which 

 was the curious Alepas squalicola!^ the knowledge of which I 

 owe to Mr. Alder's kindness. 



I have of course read your description of Alcippe, and it is 

 most clear and definite. I hope to put Arthrobalanusf in the 

 same order with it, but it will be stretching a point to do so, and 

 they must form distinct families, more distinct than any Peduncu- 

 late and any Sessile Cirripede are from each other. I hope before 

 long to indulge in a look at Alcippe. I have had occasion to re- 

 look over many specimens of Lithotrya, and am as fully convinced 

 as ever that the basal cup is fixed at a very early period, and 

 is never moved. In one specimen several specimens were em- 

 bedded in rock, parallel but in reversed positions (and others at 

 right angles) ; and of the parallel ones the greater number had 

 their capitulums {i.e. shells or valves) directed from the exterior 

 surface of the rock inwards, so that they could never reach the 

 surface, and must have lived in a subterranean cavity. I am as 

 much as ever in the dark, whether the larva creeps in or lores in. 



I had intended, but forgot, to ask you about the Clitia. All 

 which I have seen (except some rare foreign species, which I 

 have not yet touched) were fixed on fuci and stones ; and if it be 

 not asking too great a favour, I should be very much obliged if 

 you would permit me to look at any fixed on shell. Several 



* = Anelasmas squalicola. Monog. of Cirripedia, Bay Society, 1851, p. 170. 



I = Cryptojihialus minnius, Darwin. Monog. Cirripedia, Bay Sec., 1854, p. 566. 



