^ PEOCEEDINGS OF THE ACADEMY OP 



gatis, cylindricis, saepius nonnihil oscillarium modo articulatis, granulosis ; 

 vaginis sat amplis, baud acbrois, vel luteo brunneo, vel fuscentibus vel ferru- 

 gineis. 



Diam. Tricb. C. V. max y^'oo^^ 



For the second species the specific name of guitnla was proposed, from its 

 habit of forming little drop like dots on the bark on which it grows. The 

 following is the specific description. 



S. phloiophilum, in maculis subnigris, parvis, tenuibus, plerumque rotund- 

 atis, interdum enormibus, dispositnm ; trichomatibus arete intertextis, 

 ramossimis, rigidis, inaequalibus, subcylindricis, nonnihil contortis ; ramulis 

 abbreviatis vel nonnihil elongatis, apice obtuse rotundatis ; ramulorum et 

 trichomatum cellulis tri-multiseriatis, plerumque pachydermaticis, ferrugineo- 

 fuscis, enormiter globosis, homogeneis ; cellulis apiculibus interdum breve 

 cylindricis, baud articulatis ; vaginis sat amplis, luteo-brunneis vel dilute 

 fei rugineo-brunneis. 



Diam. Max. trich. cum. vag. 7^0'''' 



The other new species had been found growing in some stagnant water, 

 with a number of other algae, in New Jersey. The filaments were widely 

 separated and were so large as to be visible to the naked eye. The follow- 

 ing is the specific description : 



SiRORiPHON DisjuNCTUM. — S. trichoniatis subsolitariis, longis usque ad lineas 

 quatuor, cylindricis, ramossis ; ramulis singulis ; cytioplasmate interdum 

 ajrugiueo, plerumque aureo-brunneo, in ramulorum apice interdum nuUis 

 sed plerumque in cylindricis longis oscillarium nonnihil modo articulatis ; 

 cellulis internis uiiiseriatis, rare biseriatis, subglobosis, interdum sejunctis, 

 plerumque arete connectis et moniliformibus, modo confluentibus, baud 

 pachydermaticis ; cellulis interstitialibus nullis ; vaginis achroois, interdum 

 brunneis. 



Diam. Trich. cum vag. ^io^^i ^■'^^ "^^S- To'oo^'' 



Mr. W. H.'Walmsley exhibited a slide showing an unrecognised 

 larva which he found infesting the potato, and which he believes to 

 be a cause of the potato rot, so common in the potatoes at present 

 in the market. 



Dr. McQuillen exhibited specimens of Trichina spiralis, from a 

 patient recently dead of phthisis pulraonalis, at the Philadelphia 

 Hospital. They were detected by Dr. Hough, a resident physician 

 at the Hospital. No symptoms indicating their presence were noted 

 previous to death. 



February 1st. 

 Director S. W. Mitchell, M. D., in the Chair. 

 Nineteen members present. 



Dr. H. C. Wood exhibited to the section what he [believed to be a new 

 genus of fresh water algae. He found the plant floating upon the Schuylkill 

 River. It consists of a subglobular, bright green, firm, gelatinous thallus, 

 the outer portions of which are so condensed as to give the appearance of a 

 periderm, although there is no real periderm present. The trichomata or 

 filaments radiate from the inner part of the frond towards the outer surface, 

 but many of them have their origin in the outer parts of the thallus. They 

 are branched, and are remarkable for the fact, that they are furnished with 



