414 



generic name to Ccecalium, which was adopted hy Macgillivray in 

 his Mollusca of Aberdeen. 



Capt. Brown, in his 111. Rec. Conch. Gr. Br., 1827, although 

 writing from Edinburgh, took no notice of his predecessor's labours, 

 except to cite his figures, and proposed two genera — one, Brochus, 

 for the adult ; the other, Cornuoides, for the early state of the same 

 species. These are placed among Annelides as the third and fourth 

 genera of the family Maldanice, characterized as having the " bran- 

 chiae of the animal intermediate ; tube open at both ends." The 

 very loose descriptions and inaccurate figures of this work render 

 the identification of species extremely difficult ; nevertheless, as in 

 this British work is the first publication of foreign Cceca, it is ne- 

 cessary to analyse its contents. Aided by specimens of the supposed 

 British shells in the collection of Mr. Alder, and by a tolerably com- 

 prehensive series of known West Indian specimens, the following is 

 offered as a fair elimination of Brown's forms : — 



Genus Brochus. 



Species 1. trachiformis, Brown, = Dentalium trachea, Mont. 

 British. 



Species 2. striatus, Brown, (described as destitute of a knob, 

 but figured with one), = Dent, imperforatum, 

 Mont. = trachea, var. British. 



Species 3. reticulatus, Brown, = annulatus, adolescent. West 

 Indian. 



Species 4. annulatus, Brown. A good species, but West 

 Indian. 



Species 5. glabrus, Brown, = Dent. glabrum, Mont. British. 



Species 6. Icevis, Brown, (erroneously quoted as the Dent, im- 

 perforatum of Walk, and Mont.), ? = Dent, 

 glabrum, var. British. 



Species 7. arcuatus, Brown, = Den t. glabrum, Mont., ado- 

 lescent: v. infra. British. 



Genus Cornuoides. 



Species 1. major, Brown, 1 = Ccecum trachea, jun. British. 

 Species 2. minor, Brown, = Brochina glabra, jun. British. 



There is no evidence that the author had himself seen the shells 

 he described from Walker's figures as Cornuoides. The same errors 

 are repeated in the second edition (which is that cited in the follow- 

 ing pages), bearing date 1844. 



In 1828, Fleming in his Hist. Brit. A.n. p. 237, places his Cceca 

 (postea Ccecalia) along with Foraminifera in the genus Orthocera, 

 under Mollusca Cephalopoda, — a proceeding which Philippi charac- 

 terizes as " horribile dictu ; " but, without breaking up the tube, it 

 was not worse to regard the pfug with its knob as a chamber and 

 siphuncle, than to disregard the plug altogether and treat the shell 

 as a Dentalium. The same species are again cited, but not the same 

 shells, the Orthocera trachea being the Brochus annulatus of 

 Brown. 



In 1834 (according to Bronn, ' Lethsea,' p. 98o) Zborzewski de- 



