41 



lings, but also to a dififerent generic group. Whether this 

 be identical with a described genus, or whether it is still 

 uncharacterized, is doubtful, and cannot be decided until the 

 interior is Irnown. Such valves have been identified with 

 Obolella PhilUpsi,^o\\ (Quart. Journ.Geol. Soc. xxi, p. 101-2, 

 f. 10 a-b, 1864, by Messrs. Holl and Davidson (1. c), which 

 has been figured by Davidson (Mon. Sil. Brach., pp. 02, .342, 

 pi. iv, f. 17-19, 1860, and pi. 1, f. 25, 1870). Mr. Whitfield, 

 who kindly called the writer's attention to the dissimilarities 

 between Billings's figures, is of the opinion that 0. PhilUpsi 

 belongs to an undescribed generic group. 



l^aBM|5a§, Meuschen. Arthropomata. 1787. 



Mus. Gev. p. 438. Non-binomial. (Cf. Lamjias, Huuipb.) 



liSiaiapsas, (Humphrey) Anonymous. Arthropomaia. 17!>7. 



Mils. Calonn. p. 45 (May). No diagnosis or references. First sp. 

 Anomla fircbratida, Liu. Other sp. are Ehynchonella, Mcgerlia, &c. 

 (= Terebralula, Miiller. ) 



liaiiiffiptas, Sowerby. Arthropomata. 184!^. 



Conch. Man. ed. ii, p. 169, lapsus, = iawij:>as, Hunjphr. 



La^aaeaus, Dall. TerehratuUdce. 187®. 



Am. Journ. Concli. vi, p. 123, subg. Ttrebratella. Type Ttrehraiula cali- 

 fornica, Koch, Dall, 1. c. pi. vii, tig./, pi. \'iii, fig. 9-10. 



l^eioa'SfiyBicliiis, Hall. EhyncJionellidoi. -^ 



13th Eegent's Eep. p. 75. Types Atrypa quadricostata, Hall, 1. c. p. 86, 

 & Kep. Fourth Distr. N. York, p. 223, f. 2; and Atrypa memcosialis, Hall, 

 1. c. p. 83 (Cheni.) & Note on Foss. Chemung Group, p. 64, f. 1 a~h. Not 

 Liorhynclius, Eud. gen. Coleopt. (Cf. Meristclla, Hall, 1862, not 1861. 



Ijeptsaecaa, Dalman. Stropliomenidce. 18^§« 



Kougl. Vet. Acad. Haudl. 1827, pp. 93, 94. First sp. p. 106, Producta 

 rufjosa, Ilisiuger, Act. HolmiiB, 1826, p. 333. Dalman, 1. c. pi. i, f . 1, = 

 Anomites rhomboidcdis. Wahl. Act. Upsal. viii, p. 65. (This and L. depressa, 

 Dalman, second sp. p. 107, t. i, f. 2,-\-L. cii(/hjplia, Dalman, third sp. 1. c. 

 p. 108, t. i, f. 3, a-l) ; Hisinger sp. Bidr. Sver. Geogn. t. vi, p. 4 , — are true 

 Strophomenas tide Davidson.) Fourth sp. 1. c. p. 109, t. i, f; 4 a-d. L. 

 transversalis, Dalman, is taken by Davidson as type, 1853, pi. viii, f. 176- 

 180; 1856, pi. xii, f. 1-5. 



EiCplaeeaa, M'Coy. Productidce. 1 844. 



Carb. Foss. Ireland, pp. 105, 118. First sp. L. convoluta, Phillips, Pal. 

 Foss. Cornwall & Devon, p. 57, pi. 24, f. 96. In the diagnosis, however, 

 L. lata, von Buch, (^Choneles siriaiella, Koninck, Mon. Chonetes, p. 200, 

 pi. XX, f. 5 a-g), is mentioned in a way to indicate it as M'Coy's type. 

 {= Chonetes, Fisch.) 



