. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. SEA MUSSEL MYTILUS EDULIS. 167 particles and sweep them toward the food groove on the ventral edge (fig. 152). On the interlamellar or ab-frontal surface the cilia sweep upward or in just the opposite direction of the frontal cilia. They serve to help in producing the main current and in keeping the inner surfaces of the gills clean. The long latero-frontal cilia are undoubtedly the straining mechanism. They pro- ject out from the sides of the filaments, forming a sieve, and lash relativ
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. SEA MUSSEL MYTILUS EDULIS. 167 particles and sweep them toward the food groove on the ventral edge (fig. 152). On the interlamellar or ab-frontal surface the cilia sweep upward or in just the opposite direction of the frontal cilia. They serve to help in producing the main current and in keeping the inner surfaces of the gills clean. The long latero-frontal cilia are undoubtedly the straining mechanism. They pro- ject out from the sides of the filaments, forming a sieve, and lash relatively slowly across the middle of the frontal face of the filament (fig. 152; fig. 149, p. 165). Orton (1912) summarizes his results as follows: Thus Nucula and Mytilus have four kinds of cilia, the lateral cilia producing the main current, the frontal for collecting and transporting the food, the fronto-lateral which assists in food collecting and the ab-frontal or inner cilia which help in producing the main current, in collecting food, and in cleaning the filaments. The gland cells which Kellogg (1892) says are present in the latero-frontal region of the filaments probably serve to secrete a mucus which cements the food particles FC LFC LC. 152 —Longitudinal interfilamentary view of a living filament of the left outer lamella of the gill. X 84 approximately a, b, c, arrows indicating roughly the directions in which the latero-frontal. lateral, and frontal cilia, respectively, lash; CJ, ciliary junction; FC, frontal cilia; FG, food groove; LC, lateral cilia; LFC, latero-frontal cilia. together in morsels of convenient size. These are swept by the frontal cilia into the food groove, in which they are carried forward by the cilia lining its walls to the labial palps, which transfer them into the mouth. As an organ of respiration the gills perform their function incompletely. This was recognized by Sabatier (1874), who found that circulation took place within the fila- m
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