It. 8. Lull — Life of the Connecticut Trias. 407 



in the classificatory scheme brings it into the order Neu- 

 roptera, family Sialidse. 



A second arthropod has just been announced (Jan. 1912) by 

 Miss Mignon Talbot, professor of geology in Mount Holyoke 

 College, and represents in all probability a new species of the 

 phyllopod genus Estheria, heretofore reported from the New 

 Jersey-Pennsylvania area but not from the Connecticut valley. 

 The locality is West Holyoke, Massachusetts, which would 

 place it geologically in the " Lower Series of granitic, coarse 

 sandstones," exactly what one would be led to expect from the 

 distribution of the genus in the New Jersey-Pennsylvania area. 



Mollusca have been reported several times from the Con- 

 necticut valley, but the only authentic find seems to be that 

 recorded by Emerson (1900, p. 58). This slab, which has 

 been sent to me for study, is from near Wilbraham, Massa- 

 chusetts, and contains at least 14 imperfect impressions repre- 

 senting at least 2 species of undoubted Unio, the type of 

 Emerson's species being similar to U alatus. It should here- 

 after be known as Unio wilbrahamensis. The second species 

 is quite distinct from the first but is too imperfect to character- 

 ize. It is also unquestionably Unio, and may hereafter be 

 known as U. emersoni in honor of Professor Emerson. Ano- 

 plophora, the genus to which Emerson referred the first species, 

 Schuchert says is probably always marine, and the shells in 

 question are doubtless in fresh-water deposits. The slab, which 

 is a portion of an ice-transported bowlder, the parent ledge of 

 which is probably unknown and therefore not necessarily as 

 far south in the valley as Wilbraham, gives evidence of having 

 been deposited in permanent waters, a habitat in keeping with 

 that of present-day Unios. Wilbraham being toward the east- 

 ern side of the valley, is, therefore, near the summit of the 

 Newark series stratigraphically. 



Invertebrate Trails. 



A summary of the invertebrate trails given by Professor C. 

 H. Hitchcock in 1889 is as follows : 



Hexapod Arthropoda, 8 genera and 24 species. 



Inferior Arthropoda, including larval forms and worms, 10 

 genera, 16 species. 



Mollusca, 4 genera and 6 species. 



Lncertce sedis, 5 genera, 6 species. 



This places the total number of invertebrate and questionable 

 trails at 52. In view of the number of undoubted vertebrate 

 species known from the Newark system and the teeming num- 

 ber of living invertebrates, especially arthropods, compared 

 with vertebrates, even under adverse climatic conditions, this 



