484 Cc. A. NILSSON-CANTELL 
Genus Lepas. 
L. pectinata SPENGLER, 1793. 
Syn. NILSSON-CANTELL, 1921. 
Discussion: A\l the specimens are very typical. To the description of 
the species nothing need be added here. The species is in the collection as- 
sociated with JL. australis. Some remarks of biological interest may yet be 
noted. The individuals, situated on stalks of J/acrocysts, grow closely together, 
a feature which BROCH (1922) has demonstrated by studying individuals from 
os sepium and Janthina. The material contains individuals of different stages. 
No pupa stages seem to be represented. On the plates of the capitulum younger 
specimens of ZL. australis were placed, also pupa stages, which belong to Z. 
australis, of which I have studied individuals numbered 595, consisting of many 
individuals of all sizes. Under the same number 595 only three fullgrown 
specimens of L. fectinata were taken. I can here state that Z. australis can 
erow on Macrocystts and on the plates of L. australis and pectinata. I never 
found in this collection specimens of ZL. pectinata situated on each other or on 
L. australis. This may perhaps be another question of biological interest not 
mentioned by BROcCH, who has raised other problems as regards the fixation 
not possible to explain on spirit material. In some smaller individuals pec- 
tination was observed on the valves but not in the fullgrown. These smaller 
do not, however, belong to some of the two varieties known. 
Localities: Masatierra. On JZacrocysts drifted from the continent, 28. 
iv. 1917. No. 594 and 596, many specimens, associated with L. australis welt- 
nert. No. 595, a few specimens, also together with ZL. australis weltnert. — 
Cumberland Bay, on a buoy, 3. 1. 1917, No. 205. One specimen. 
These localities are not quite new as according to WELTNER (1897) L. 
fpectinata was found by Dr. PLATE on floating algae between the Juan Fernan- 
dez Islands and Valparaiso. } 
Distribution: Cosmopolitan, mostly in tropical seas. Pelagic on floating 
objects. 
L. anatifera Linné, 1767. Fig. 1. 
Syn. NILSSON-CANTELL, 1921. 
Discussion and complementary description: Many fullgrown individuals of 
this species were collected. It is of interest to note that this species is very 
variable, as also stated by several authors. This caused me (1928) for instance 
to describe L. testudinata AURIVILLIUS (1892) as a variety of L. anatefera and 
a new variety xonfurcata (NILSSON-CANTELL, 1927). 
In Dr. BACKSTROM’s material I have found two forms of the species 
slightly different in shape. It is, however, not possible to describe a new 
variety, as the differences are neither very great nor constant. Both types are 
figured here (fig. 1). 
