526 Obituary — Dr. Harvey B. Roll. 



more resemblance to a dental fragment of Notidanus than the 

 Swabian fossil described by Oppel, as far as the latter's figure will 

 enable one to judge. It does not agree with the teeth of Palceospinax 

 or any other Liassic Shark I have had the opportunity of studying, 

 and Tate and Blake's determination is very possibly correct; but 

 more satisfactory evidence must still be awaited before there is 

 absolute certainty of the presence of Notidanus among the early 

 Jurassic fauna. A. Smith Woodward. 



ENTOMOSTRAOA IN THE RHJETICS. 

 Sir, — In the Geological Magazine, May, 1886, p. 203, a slight 

 error occurs in Mr. J. S. Gardner's interesting paper, in stating that 

 " the valves of a species of Cyclas abound in the Bhaetics." This 

 should have been either Candona or possibly Cypris ; the latter may 

 be after all correct, as it is associated with the freshwater aquatic 

 Moss, Naiadites. The supposed Cyclas has been determined to be 

 Estheria, a brackish-water Crustacean, though Sowerby stated it to 

 be Cyclas, when my work on Fossil Insects was published. In 

 the Mote (2) at the bottom the reference should have been not 

 to the Estheria bed in particular, but to the Bhaatics in general 

 (in which the former is included), which may be considered to be 

 junction or passage beds between the Trias and the Lias. 



P. B. Brodie. 



OBITI7AEY. 



HARVEY BUCHANAN HOLL, M.D., F.G.S. 



Born 28th September, 1820 ; Died 11th September, 1886, 



This able geologist and palaeontologist was son of the late William. 

 Holl, Esq., formerly of Worcester. After passing through Dr. Walter's 

 School at Worcester, he entered the Medical College in Birmingham. 



During this period of Harvey Holl's career, when he was only about 

 17 years of age, he became acquainted with Sir Henry de la Beche, 

 and was invited by that distinguished geologist to accompany him in 

 a geological reconnaissance through Devon and Cornwall. It was 

 probably owing to this expedition (which extended over some six 

 months) that young Holl became confirmed in his geological tastes, 

 and for a time was led entirely to abandon his medical studies. 



From the good opinion which Sir Henry de la Beche formed of 

 Holl's work in the field, he recommended the youthful geologist to 

 his friend Professor Bogers, of Philadelphia (who was seeking an 

 assistant), and Harvey Holl started off to join his new chief and 

 take a part in the Geological Survey of Pennsylvania. In this 

 interesting region, Holl remained for about three years, and spent a 

 year longer in the United States geologising on his own resources. 



Upon his return to England, Holl entered as a student at St. 

 George's Hospital, and successfully passed the Boyal College of 

 Surgeons in London. In 1859 he graduated as M.D. at King's 

 College, Aberdeen. 



