GASTEROPODA OP THE LOWER GREEN MARLS. 149 



Formation and locality: From the base of the Lower Marl Beds at 

 Haddonfield, New Jersey. 



VERMETID^. 



Genus SILIQUARIA Brug. 



SiLIQUAEIA PAUPEEATA, H. Sp. 



Plate xviTi, Figs. 26-28. 



A few spechnens only of casts of tubes referable to this genus have 

 come under my notice. Two of them are coiled and retain the younger 

 parts of the specimens, while most of them are only fragments represent- 

 ing medium sized parts of the tubes, or parts from the large irregularly 

 coiled portions. The tube is very gradually tapering, and either compactly 

 or loosely coiled in the upper part; but all show their relations to the genus 

 Siliquaria, by the narrow ridge left along the upper side of the tube by the 

 material which has filled the slit. There is no distinctive feature repre- 

 sented on the specimens by which they can be distinguished from casts of 

 other species of the genus; and, as no evidence of the surface characters 

 are preserved, no data for comparison is left. 



Some of the specimens included under the species are marked on the 

 label accompanying them in the cabinet of the Acad. Nat. Sci., Phila., as 

 types of Mr. Gabb's Laxispira lumbricalis, which species is also the type 

 of the genus Laxispira. I can not, however, feel satisfied that they were 

 ever used by Mr. Gabb as such, nor do I see how he could have con- 

 structed the figure given of that species and genus from the specimen in 

 question; as there certainly is no evidence of the longitudinal striae there 

 represented on the specimen which I have figured on PL xviii, and which 

 is the best of those on the card labeled with that name, and marked 

 "types." 



Formation and locality: Some of the specimens are marked as coming 

 from Haddonfield, New Jersey, collected by T. A. Conrad; others were 

 associated with specimens without definite locality, but mostly Lower Marl 

 fossils. 



