154 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Staten Island; Xewport, E. I., Bailey ; dredged off Xapatree Point, 

 E. I., Prof. Eaton ; Gay Head, in eight or ten fathoms ; and common 

 from Nahant northward. 



Together witli Delesseria sinuosa, this species forms the bulk of the membranaceous 

 red sea-weeds collected by ladies on our northern coast for ornamental purposes. 

 Probable in no part of the world are more beautiful and luxuriant specimens found 

 than at Magnolia Cove, Gloucester, Mass. Specimens vary very much in breadth. 

 Some have the main divisions an inch wide and the terminal divisions are densely 

 flabellate. Others are scarcely an eight of an inch wide and the terminal divisions 

 are rather diffuse, the fimbriations being prolonged into sharp teeth. The first-men- 

 tioned form approaches the figure in the Phycologia Britanuica, while the last resem- 

 bles Splim'ococcas corotwpifolius. The Long Island forms are scarcely an inch high. The 

 species is found at all seasons of the year, and inhabits rather deep water, its favorite 

 habitat being the roots oi Laminar Up. 



LOMEXTAEIA, (Gaill.) Thnret. 



(From lomeutum, a pod with constricted joints.) 



Fronds tilamentons, branching, hollow, with constricted nodes, formed 

 of one or more layers of roundish-angnlar cells with a few longitudinal 

 filaments in the interior; tetraspores tripartite, borne in cavities 

 formed by the infolding of the cortex; cystocarps external, sessile, con- 

 taining a nucleus composed of oblong masses of irregularly radiating 

 spores attached to a placenta surrounding a large basal carpogenic cell, 

 which is connected with the pericarp by filaments. 



A small genus, containing species which have been placed by some writers in Chylo- 

 cladia and Chrysymenia. As limited by Thuret, the genus includes species in which 

 the tetraspores occuj)y small cavities hollowed out in the cortex. The development 

 of the fronds has not been fully studied. They are hollow and much constricted at 

 the joints, but in our species there are no distinct diaphragms as in Champia. The 

 walls of the filaments are composed of a membrane consisting of a single layer of round- 

 ish-angular cells, or there are two or three layers, the outer cells being smaller than 

 the rest. The inner side of the wall is traversed by long, slender filaments, to which 

 are attached, laterally, small round cells, by which the filaments are attached to the 

 walls. The cystocar^is are external, and, in section, one sees a large basal triangular- 

 ovoid carpogenic cell surrounded by closely packed sporiferous lobes, in which the cells 

 are at first arranged in the form of densely radiating filaments, but at the time of ma- 

 turity become irregularly j)laced. The pericarp is rather broadly ovate, with a dis- 

 tinct terminal carpostome, and its walls are connected with the carpogenic cell by 

 filaments, between the bases of which lie the sporiferous masses, around which is a 

 gelatinous envelope. 



L. UNCINATA, Menegh., in J. Ag., Spec. ( Chylodadia Baileyana, Ilarv., 

 Xer. Am. Bor., Part II, p. 185, PI. 20 c. — Chylodadia undnataj Ag., Zan. 

 Icon. Adr., PL 43. — Chondrosiphon undnatus, Klltz.) 



Fronds brownish red, densely tufted, two to five inches high, tubular, 

 irregularly much branched, branches about one-tenth of an inch in diam- 

 eter, divaricated, secund or scattered, often recurved, branchlets nar- 

 rowly fusiform, much contracted at base, secund; tetraspores tripartite 



