Mr. L. Reeve on the Recent Terebratulse. 447 



to TerebrateUa crenuluta and Evansii by Dr. Gray and Mr. Reeve 

 is erroneous." Not having sufficiently understood the fossil type 

 of Magas, I may have erred in this respect ; but the loop of 

 these species is a little removed from the typical loop of Tere- 

 brateUa, as seen in T. magellanica, and is at least intermediate 

 in its characters between that and Magas. The only other 

 altered generic position that Prof. Suess can disapprove of (he 

 does not name any other) is that of removing TerebrateUa Cu- 

 mingii into the genus Boiichardia. Mr. Davidson himself v\'as 

 puzzled to know what to do with this species when first de- 

 scribing it, and only referred it to TerebrateUa provisionally, 

 with a note of interrogation. The shell possesses a particular 

 generic structure apart from any consideration of the loop ; and 

 that structure — an acuminated beak with a terminal foramen, far 

 removed from the typical structure of T. mageUanica or cruenta, 

 which species possess allied though not similar loops to that of 

 B. Cumingii — is the structure of Bouchardia tuUpa. The new 

 species in the British IMuseum which I have named Bouchardia 

 fibula, and which Mr. Woodward has shown me to be almost 

 identical with the fossil T. compta, has a similarly acuminated 

 beak with a terminal foramen. The change of loop in these 

 three shells appears to me to be a gradual modification in which 

 that organ becomes enfeebled and rudely callosified, ceasing to 

 be any longer available as a generic character. 



In drawing up my tables of geographical distribution, I in- 

 cluded only those species of which I obtained actual specimens 

 for examination, comparison, description, and drawing, and I dis- 

 carded all of which the species and habitat could not actually be 

 verified. But, with all this care, the work is far from perfect. 

 Prof. Suess will be able to improve materially upon my 'Revi- 

 sion ' in the next edition of his * Wohnsitze.^ Here are the 

 materials. Further research has enabled me to add the following 

 names to the synonymy : — T. scobinata, Gmelin, and T. decus- 

 sata and irregularis, De Blainvillc, are varieties of Megerlia 

 truncata, Linn. T. subvitrea, Leach, is the same as Wald- 

 heimia a'anium, Miill. T. bilobata and pectinata, De Blain- 

 ville, are further varieties of TerebrateUa magellanica, Chemn. 

 T. sanguinolenta, Gmelin, is the same as Tereh'atella sanguinea, 

 Chemn. T. nucleus and avenacea, Miiller, are varieties of Te- 

 rebratulina caput-serpentis, Linn.; and T. rotundata, De Blain- 

 villc, is a variety of Kraussia rubra, Pallas. I incline to 

 believe also that T. Kochii, Kuster, and T. eximia, Philippi, are 

 merely varieties of IValdheimia globosa. But even the name 

 globosa seems destined to fall into the obscurity of a synonym. 

 Mr. Davidson, whose few venial errors, made in the very dawn 

 of his invaluable researches, have been lifted into such unde- 



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