454 



Field Notes 



is so short as to make them appear rather clubbed. They are 

 also thickly and finely barbed (see figure d). The legs are also 

 rather long, and the internodes cylindrical. In colour it is 

 a yellowish red, and much paler than holosericeum. Under the 

 microscope the two species are sufiiciently distinct, and also 

 appear to be distinct from the larva figured in my first paper, 

 which is doubtless that of another species of Tromhidium — not 

 yet identified. 



♦ » 



MARINE ZOOLOGY, 

 Zoophytes in the Humber. — The muddy nature of the 

 Humber no doubt deters many from searching for the interest- 

 ing and beautiful forms of life known as Zoophytes. In the 

 search for these objects in the Humber, one must be prepared 

 to bring away often more mud, etc., upon one's clothes than is 

 desirable. I have taken the following species on the dates 

 named. On August 25th, in the St. Andrew's Dock Extension, 

 and along the under side of the lowest whaling-piece which 

 runs horizontally along the wooden quay (the water in the dock 

 being low to meet the level of the next neap tide), I noticed 

 tufts of muddy objects. I secured one, and on arrival home, 

 found it to be Ohelia dichotoma, and parasitic upon it were 

 numerous colonies of stalked animalculae, also Bacillaria 

 paradoxa (diatoms), wdth its puzzling unceasing motion. On 

 August 26th, I obtained the following additional species of 

 polyzoa, Memhranipora memhranacea, Bowerbankia gracillima, 

 and Pedicellina gracilis. On October ist, I took a shoot of 

 Obelia, a fine, large specimen, every bell displaying its flower- 

 like polypite, and crawling upon the colony were several young 

 specimens (I counted nine), of a species of the Nudibranchiata 

 or naked gilled slugs. In two days they had completely stripped 

 it of all its animal tissues. October 9th at Hessle, directly 

 opposite the Beacon, at dead low water, I obtained at the roots 

 of Fucus, a small stunted specimen of Seriularia operculata, 

 and a single dead shoot of Seriularia argentea. In conclusion, I 

 should like to inform all lovers of pond and rockpools, that the}^ 

 will find many other forms of life to interest them in our docks. 

 For rockpool and sea-shore hunting, dead low water spring 

 tides are the best, whereas for the docks, the rule is reversed. 

 One or two hours before level water lowest neap tides is the 

 best time, because all stone and woodwork which is covered 

 at all other tides, become bared. — J. Thompson, Hull. 



Naturalist. 



